Select the two values of x that are roots of this equation. 2x2 + 7x + 6 = 0
Answers
Answer:
x = -3/2, -2
Step-by-step explanation:
2x^2 + 7x + 6 = 0
(2x + 3)(x + 2) = 0
(2x + 3)
2x = -3
x = -3/2
(x + 2)
x = -2
Answer:
[tex]\large {\textsf{A and C}}\ \implies x_1=-2,\ x_2=-\dfrac{3}{2}}[/tex]
Step-by-step explanation:
In this problem, we can use two methods to solve for the values of x (roots) of the given equation. Those methods are: using the quadratic formula and factoring.
Standard Form of a Quadratic Equation: ax² + bx + c = 0, where a ≠ 0
Given equation: 2x² + 7x + 6 = 0
⇒ a = 2, b = 7, c = 6
Method 1: Using the Quadratic Formula
Quadratic Formula: [tex]x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}[/tex]
Step 1: Substitute the values of a, b, and c into the quadratic formula.
[tex]\implies x=\dfrac{-7\pm\sqrt{7^2-4(2)(6)}}{2(2)}\\\\[/tex]
Step 2: Simplify
[tex]\implies x=\dfrac{-7\pm\sqrt{\bold{7^2}-4(2)(6)}}{\bold{2(2)}}\\\\\implies x=\dfrac{-7\pm\sqrt{49-4\bold{(2)(6)}}}{4}\\\\\implies x=\dfrac{-7\pm\sqrt{49\bold{-4(12)}}}{4}\\\\\implies x=\dfrac{-7\pm\sqrt{\bold{49-48}}}{4}\\\\\implies x=\dfrac{-7\pm\sqrt{\bold{1}}}{4}\\\\\implies x=\dfrac{-7\pm1}{4}[/tex]
Step 3: Separate into two possible cases and solve for the values of x.
[tex]\implies x_1=\dfrac{-7-1}{4}\implies \dfrac{-8}{4}\implies \boxed{-2}\\\\\implies x_2=\dfrac{-7+1}{4}\implies \dfrac{-6}{4}\implies\boxed{-\dfrac{3}{2}}[/tex]
Method 2: Solve by Factoring
In order to be able to solve this equation by factoring, let's rewrite the middle term by finding the factors that give a product of the first and last terms (a • c = 12) and give us the sum of the middle term (b = 7).
Factors that give a product of a • c: 4 • 3 = 12
Factors that give a sum of b: 4 + 3 = 7
Step 1: Rewrite the given equation with those factors.
2x² + 7x + 6 = 0
⇒ 2x² + 4x + 3x + 6 = 0
Step 2: Factor out 2x and 3.
(2x² + 4x) + (3x + 6) = 0
⇒ 2x(x + 2) + 3(x + 2) = 0 [ Factor out the the common factor. ]
⇒ (2x + 3)(x + 2) = 0
Step 3: Apply the Zero-Product Property (if m•n = 0, then m = 0 or n = 0).
a) 2x + 3 = 0 ⇒ 2x = -3 ⇒ x = -³⁄₂
b) x + 2 = 0 ⇒ x = -2
Therefore, the two roots of this equation are x = -³⁄₂ and x = -2.
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Related Questions
A can of soup has a height of 10 cm. If the volume of the can is 363 cubic cm, what is its radius?
Answers
The radius of the circular cross-section of the can of soup is; 3.4cm.
What is the radius of the can of soup?Since, the can has a height of 10cm and the volume of the can is 363cm³, it follows that the area of the circular cross-section can be evaluated as;
A = 363/10 = 36.3cm²
Hence, it follows that the radius can be evaluated as follows;
36.3 = 3.14 × r²
r² = 36.3/3.14
r² = 11.56
r = 3.4cm
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A pillar 80 m tall casts a shadow 39 m long. Find the distance between the top of the pillar and the foot of the shadow
Answers
Answer:
89
Step-by-step explanation:
[tex] \sqrt{ {80}^{2} + {39}^{2} } = 89[/tex]
The distance between the top of the pillar and the foot of the shadow is 80 meters.
How to find the distanceLet's call the distance we want to find "x".
In particular, set up the following proportion:
pillar height / shadow length = distance / shadow length
Plugin the given values
80 / 39 = x / 39
Simplifying and solving for x
x = (80 / 39) * 39
x ≈ 80
Therefore, the distance between the top of the pillar and the foot of the shadow is 80 meters.
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Call a number quasi-prime if it is composite but not divisible by 2, 7, or 11. For instance, the five smallest quasi-prime numbers are 5, 9, 15, 25, 27, and 39. There are 95 prime numbers less than 500. How many quasi-prime numbers are there less than 500
Answers
The number of quasi-prime numbers that are less than 500 = 92
What are quasi-prime numbers?Quasi-prime numbers are those numbers that are also known as semi prime numbers which can not be divided by 2,7 or 11.
They are often derived from prime numbers which are 95 in number from 2 - 499. ( less than 500).
The 95 prime numbers - 3 numbers( such as 2,7 or 11) = 92
Therefore, the number of quasi-prime numbers that are less than 500 = 92
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Classify the following triangle. Check all that apply.
Answers
A right triangle will have one right angle (often denoted by a small square connecting the sides of the angle) and two acute angles
An obtuse triangle will have one angle above 90° and two acute angles
An isosceles will have at least two sides of equal length and two angles of equal measure
An equilateral triangle is where all the sides are the same length and all the angles are 60°
A scalene triangle is a triangle in which all the sides are different lengths
math!!
PLEASE HELP!!
what is the angle indicated in the triangle below??
a) 46 degrees
b) 65°
c) 44°
d) 35°
e) 55°
f) 90°
Answers
Answer:
e) 55°
Step-by-step explanation:
use the tangente ratio
[tex]tan\alpha =\frac{10}{7} =1.42857[/tex]
[tex]angle(?)=tan^{-1} (1.42857)=55^{0}[/tex]
Hope this helps
Answer:
55 degrees (e)
Step-by-step explanation:
This is a trigonometry problem. We are given a right triangle with an unknown angle in which the opposite and adjacent sides of the angle are known (10 and 7). We also know that the tangent of any angle is the length of the opposite divided by the length of the adjacent. If we let the unknown angle be Ф, we can say that tan(Ф) = 10/7. To isolate Ф, all we have to do is take the inverse. In other words, Ф = arctan(10/7). Using a graphing calculator, we find that arctan(10/7) is approximately 55 degrees.
the tens digit of a two digit number is 5 greater than the units digit. if you subtract the reversed number from the original number you will get 1/4 of the original number
what is the original number
Answers
From the given information, the original number is 180. 02
How to determine the original numberLet the unit digit be x
The unit in tens is x+ 5
The original number = 10(x+5) + x = 11x + 50
The reversed number = 10x+ (x+5) = 11x+5
From the information given, we have that
(11x + 50) - (11x + 5) = 1/4 (11x + 50)
Expand the expression
11x + 50 - 11x - 5 = 1/ 4(11x + 50)
Collect like terms
11x - 11x + 50 - 5 = 1/ 4 (11x + 50)
45 = [tex]\frac{11x + 50}{4}[/tex]
Cross multiply
45 * 4 = 11x + 50
180 = 11x + 50
11x = 180 -50
11x = 130
x = 130/11
x = 11. 82
To find the original number, we have
Original number = 11x + 50
Substitute the value of x
Original number = 11(11.82) + 50
Original number = 130. 02 + 50
Original number = 180. 02
Therefore, the original number is 180. 02
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4.Find three consecutive integers such that the difference of double the largest number and triple the smallest number is -44. Find the three numbers by setting up an equation. Make sure to define your variables
Answers
Solving a linear equation, we will see that the 3 numbers are:
48, 49, and 50.
How to find the 3 numbers?
3 consecutive integers can be written as:
x, x + 1, x + 2
Here we know that 2 times the largest number minus 3 times the smallest one is -44, then:
2*(x + 2) - 3x = -44
We can solve that linear equation for x:
2x + 4 - 3x = -44
(2 - 3)x = -44 - 4
-x = -48
x = 48
Then the 3 numbers are:
x = 48x + 1 = 49x + 2 = 50If you want to learn more about linear equations:
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Find a in degrees.
a
6
√11
5
? ]°
Round to the nearest hundredth.
Answers
Answer:
33.55
Step-by-step explanation:
[tex]sin \alpha = \sqrt{11} \div 6 \\ [/tex][tex] \alpha = {sin}^{ - 1} 0.5527[/tex][tex] \alpha = 33.55[/tex]Answer:
α = 33.56° (nearest hundredth)
Step-by-step explanation:
Trigonometric ratios
[tex]\sf \sin(\theta)=\dfrac{O}{H}\quad\cos(\theta)=\dfrac{A}{H}\quad\tan(\theta)=\dfrac{O}{A}[/tex]
where:
[tex]\theta[/tex] is the angleO is the side opposite the angleA is the side adjacent the angleH is the hypotenuse (the side opposite the right angle)Given:
[tex]\theta=\alpha[/tex]O = [tex]\sf \sqrt{11}[/tex]A = 5H = 6As all sides of the right triangle have been given, any of the trigonometric ratios can be used to find α.
Sine Ratio
[tex]\begin{aligned}\sf \sin(\alpha) & = \sf \dfrac{\sqrt{11}}{6}\\\implies \alpha & = \sf \sin^{-1}\left(\dfrac{\sqrt{11}}{6}\right) \\& = \sf 33.55730976...^{\circ}\end{aligned}[/tex]
Cosine Ratio
[tex]\begin{aligned}\sf \cos(\alpha) & =\sf \dfrac{5}{6}\\\implies \alpha & = \sf \cos^{-1}\left(\dfrac{5}{6}\right) \\& = \sf 33.55730976...^{\circ}\end{aligned}[/tex]
Tangent Ratio
[tex]\begin{aligned}\sf \tan(\alpha) & =\sf \dfrac{\sqrt{11}}{5}\\\implies \alpha & = \sf \tan^{-1}\left(\dfrac{\sqrt{11}}{5}\right) \\& = \sf 33.55730976...^{\circ}\end{aligned}[/tex]
Therefore, α = 33.56° (nearest hundredth)
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A sports league has 10 teams. Each team must send at least one player to the league's annual meeting, but may send as many as 5 if space is available based on the cost of the meeting. Holding the meeting costs the league $600 for the facility, plus $50 per player for food and materials. The league cannot spend more than $1900 on the meeting. Which inequality shows the number of players, n, who could be at the meeting?
Answers
can I get your number personally
Medians: Using the methods previously described, the medians of each group were found to be:
Answers
Answer:
Medians: Using the methods previously described, the medians of each
group were found to be: Low: ( , ) Medium: ( . ) High: ( . ) Use these points to find the equation of the median fit regression line. Slope: What is the slope of the median regression line? m = Jig—y" = (Round to the nearest H—xL hundredth.) Y-lntercept: What is the y-intercept of the median regression line? kW _ 3 b _ (33—(—U.01)(2300))+(27—(—0.01)(3350))+(19—(—U.01)(4400)) _ 3 m (Round to the nearest hundredth.) Regression Line: The equation of the median regression line isy= x+
look at image.................
Answers
Answer:
-1/3
Step-by-step explanation:
When x is 1, y is 5
When x is 4, y is 4
5-4=1
1-4=-3
1/-3=-1/3
I am not able to solve this question
Answers
First, we multiply the numbers : 10 x 5 = 50
Now, we multiply r squared to r^6. To do this, we add the index numbers together : r^2 x r^6 = r^(2+6) = r^8
So, the answer is 50r^8, or b.
omg help me please!!!!
Answers
A(n) Blank______ is a data characteristic that stands for a value that changes or varies over time. Multiple choice question. information fact variable
Answers
Variable is a data characteristic that stands for a value that changes or varies over time.
A variable is any characteristics, number, or quantity that can be measured or counted. A variable may also be called a data item. Age, sex, business income and expenses, country of birth, capital expenditure, class grades, eye colour and vehicle type are examples of variables.
Information is that portion of the content of a signal or message which conveys meaning. (so this is the wrong option)
A fact is a quantitative piece of information - such as a sale or a download. (so this is also the wrong option)
Hence, a Variable is a data characteristic that stands for a value that changes or varies over time.
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Each statement describes a transformation of the graph of . Which statement correctly describes the graph of y = f(x − 7) + 3?
A.
It is the graph of f translated 3 units up and 7 units to the left.
B.
It is the graph of f translated 7 units down and 3 units to the right.
C.
It is the graph of f translated 7 units up and 3 units to the right.
D.
It is the graph of f translated 3 units up and 7 units to the right.
Answers
Answer: D. It is the graph of f translated 3 units up and 7 units to the right
Step-by-step explanation:
the +3 part of the equation makes the function translated vertical 3 units
then the x - 7 part makes it translate horizontal to the right 7 units (always the opposite of the sign)
because when
x-7=0,
x=7
I will give Brainliest.
Answers
Answer:
m=months
clark= 10000-105m
lois= 7500-50m
10000-105m=7500-50m
+50m
10,000-55m=7500
-10000
-55m=-2500
simplify
55m=2500
divide by 55
m=45.45
so i would say b
Hope This Helps!!!
help me please i dont understand
Answers
Answer:
96 ft^2.
Step-by-step explanation:
Area of shaded region = area of the original rectangle - area of the one removed
= 8 * 16 - 8*4
= 128 - 32
= 96
Pleased help asp
Please help asp
Please help asp
Answers
The value of an investment portfolio decreased by 8 % in 2010. In 2011, its value increased by 5% of
its value in 2010. Given that the value of the portfolio at the end of 2011 was $ 61 824, find its
original value.
Answers
Answer:
$63422.42
Step-by-step explanation:
join my stream for an explanation
(ChildOfHermes)
please mark brainliest
im only streaming for 15.5 hours
Can you please find the value of x
Answers
Answer:
14
Step-by-step explanation:
when two lines intersect, the opposite angles are equal: vertical angles rule
this means that 88 and 6x + 4 are the same, therefore we get the equation 6x+4 = 88.
subtracting 4 from both sides, we find that 6x = 84
we get our final answer by dividing each side of the equation by 6:
x = 14
b.HELPPPP MEEEE PLSSSS AND THANK YOUU
Answers
Answer:
A. (3, 8) and [tex]2\sqrt{2}[/tex]
B. (2, 4) and [tex]2\sqrt{10}[/tex]
Step-by-step explanation:
Midpoint formula: [tex](\frac{x1+x2}{2} ,\frac{y1+y2}{2})[/tex]
Distance formula: [tex]\sqrt{(x_{2}-x_{1}) ^2+(y_{2}-y_{1}) ^2 }[/tex]
A. plug in the points in the formulas
(4, 7) and (2, 9)
Midpoint:
[tex](\frac{4 + 2}{2} , \frac{7+9}{2} )=6/2, 16/2 = (3,8)[/tex]
Length:
[tex]\sqrt{(2-4)^2+(9-7)^2}=\sqrt{4+4} =\sqrt{8} =2\sqrt{2}[/tex]
B.
(5, 5) and (-1, 3)
Midpoint:
[tex](\frac{5-1}{2} , \frac{5+3}{2} )=4/2,8/2=(2,4)[/tex]
Length:
[tex]\sqrt{(-1-5)^2+(3-5)^2} =\sqrt{-6^2+-2^2} =\sqrt{36+4} =\sqrt{40} = 2\sqrt{10}[/tex]
Can you consider marking my answers as brainliest lol it would mean a lot. Hope this helped.
Which equation represents the line that is perpendicular to and passes through (-40,20)?
Answers
The equation of the perpendicular line to the given line is: y = -5/4x - 30.
What is the Equation of Perpendicular Lines?The slope values of two perpendicular lines are negative reciprocal of each other.
Given that the line is perpendicular to y = 4/5x+23, the slope of y = 4/5x+23 is 4/5. Negative reciprocal of 4/5 is -5/4.
Therefore, the line that is perpendicular to it would have a slope (m) of -5/4.
Plug in m = -5/4 and (x, y) = (-40, 20) into y = mx + b to find b:
20 = -5/4(-40) + b
20 = 50 + b
20 - 50 = b
b = -30
Substitute m = -5/4 and b = -30 into y = mx + b:
y = -5/4x - 30
The equation of the perpendicular line is: y = -5/4x - 30.
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Find two numbers such that one number is 3 less than twice as big as the other number and the two numbers sum to 21.
Answers
Answer:
The two numbers are:
8 and 13
Step-by-step explanation:
a = 2b - 3 Eq. 1
a + b = 21 Eq. 2
Replacing Eq. 1 in Eq. 2:
(2b-3) + b = 21
3b - 3 = 21
3b = 21 + 3
3b = 24
b = 24/3
b = 8
from Eq. 1
a = 2*8 - 3
a = 16 - 3
a = 13
Check:
From Eq. 2:
a + b = 21
13 + 8 = 21
To join a new fitness center, there is a $40 initiation fee. It costs an additional $10 for every spinning class you attend. What is the average cost per class if you take 10 classes in the first month of joining the fitness center
Answers
the average cost per class is $14.
Think of this as an algebraic equation, which would be expressed as 40+10s=total cost
The (s) would be the number of spinning classes you decide to take.
Therefore to find the average cost of the class, you would plug in 10 classes for s.
This brings the total cost to $140 dollars.
To find the average you must divide this cost by the number of classes you took.
This will be the price per class, which is $14.
Statement of the equality of two expressions formulated by way of making use of a set of variables the algebraic operations, particularly, addition, subtraction, multiplication, department, elevating to energy, and extraction of a root.
In arithmetic, an algebraic equation or polynomial equation is an equation of the form P=0 where P is a polynomial with coefficients in some area, regularly the field of rational numbers.
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The coordinates of C are (4,4), and the midpoint of CD is at M(-2,-6), what are the coordinates of point D?
Answers
The coordinates of D is (-8 , -16 )
What are Coordinates ?Coordinates are the location of a point on the x-y plane.
It is given that the coordinates of C are (4,4)
the midpoint of CD is at M(-2,-6)
The distance between D to the midpoint is equal to distance between C and the mid point M .
The distance between C and M is
( -2 - 4 , -6 -4 )
( -6 , -10)
Adding this to the mid point will give the location of D
(-2 -6 , -6 , -10 )
(-8 , -16 )
Therefore the coordinates of D is (-8 , -16 ).
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Answer:
-8, -16
Step-by-step explanation:
got it right on the est.
Area =
Help me please :)
Answers
Answer:
24 unit²
Step-by-step explanation:
use Pythagoras to calculate the height of triangle
which gives you 6 √100-64
then half hight x base
Find the vertex of the function given below.
y= 2x² + 8x+1
A. (-2,-7)
B. (-2,-1)
OC. (3,-4)
D. (1,7)
Answers
Answer:
A
Step-by-step explanation:
given a quadratic function in standard form
y = ax² + bx + c (a ≠ 0 ) then the x- coordinate of the vertex is
x = - [tex]\frac{b}{2a}[/tex]
y = 2x² + 8x + 1 ← is in standard form
with a = 2 , b = 8 , then
x = - [tex]\frac{8}{4}[/tex] = - 2
substitute x = - 2 into the equation for corresponding y- coordinate
y = 2(- 2)² + 8(- 2) + 1 = 2(4) - 16 + 1 = 8 - 16 + 1 = - 7
vertex = (- 2, - 7 )
On the number line above, point L (not
shown) is located on line segment JK so that
JL = LK. What is the position of point L?
Answers
The position of point L is halfway between points K and L
How to determine the position?The line segment is given as:
JK
This means that the endpoints of the line are:
J and K
Also, we have:
JL = LK
So, we have:
JK = JL + LK
Substitute JL = LK
JK = JL + JL
This gives
JK = 2JL
Divide by 2
JL = 1/2 JK
Hence, the position of point L is halfway between points K and L
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9 times 2/3=
SIMPIFIED
Answers
Answer:
6
Step-by-step explanation:
9 x 2/3
9/1 x 2/3 = 18 / 3 = 6
The question "How many servers will be needed to reduce the waiting time of restaurant customers to less than 9 minutes?" is a type of
Answers
The question posed in the task content is a goal seeking analysis type of question.
How many servers will be needed to reduce the waiting time of restaurant customers to less than 9 minutes is a goal seeking analysis question.
Goal seeking analysisA goal seeking analysis question is a type of question which helps to determine the efficient and effective measure of achieving a goal either individually or in a group.
The question will help the manager of the restaurant to determine how many servers is needed in order to reduce the waiting time of customers.
Complete question:
The question "How many servers will be needed to reduce the waiting time of restaurant customers to less than 9 minutes?" is a type of
a. goal-seeking analysis.
b. what-if analysis.
c. sensitivity analysis.
d. utility modeling.
a. goal-seeking analysis.
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