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2 years ago

HELPPPPPP ASAPPPPP PLS

Mathematics

1 answer:

Mars2501 [29]2 years ago

6 0

Answer: B

Step-by-step explanation:

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Given the function f(x) = −2x + 8, find x if f(x) = 14 ...?

Over [174]

14 = - 2x + 8
2x = - 6
x = - 3

5 0

3 years ago

Read 2 more answers

Write down the quadratic equation whose roots are $x = -7$ and $x = 1,$ and the coefficient of $x^2$ is 1. Enter your answer in

pav-90 [236]

<h2>Steps:</h2>

So firstly, since we know that the coefficient of x² is 1, this means that this is our base equation:

y = x² + bx + c

Now, since we know that the roots are -7 and 1, set y = 0 and set x = -7 and 1 and simplify:

$0=(-7)^2+b(-7)+c\\0=49-7b+c\\-49=-7b+c\\\\0=1^2+b(1)+c\\0=1+b+c\\-1=b+c\\\\-49=-7b+c\\-1=b+c$

Now with this, we can set up a system of equations to solve for b and c. For this, I will be using the elimination method. For this, subtract the 2 equations:

$\begin{alignedat}{2}-49&=-7b+c\\-(-1&=b+c)\\-48&=-8b\end{alignedat}$

Now that the c variable has been eliminated we can solve for b. For this, divide both sides by -8 and your first part of your answer is b = 6.

Now that we know the value of b, plug it into either equation to solve for c:

$-49=-7(6)+c\\-49=-42+c\\-7=c\\\\-1=6+c\\-7=c$

<h2>Answer:</h2>

<u>Putting it together, your final answer is x² + 6x - 7 = 0.</u>

4 0

3 years ago

PLZ HELP I WILL MARK BRAINLYST

Gre4nikov [31]

$c - 7 \geqslant - 3 \\ c \geqslant - 3 + 7 \\ c \geqslant 4$

8 0

3 years ago

Help with one last math question <br> thank u

Vitek1552 [10]

It has to be the last one, D. I did it over 3 times to make sure.

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3 years ago

HELLPPPPPPPPPPP PLEASE

KiRa [710]

Alright, so we plug (-2) in for x. (-2)^2 =4, and we can plug that in as 4(4)+(-2)+5. Next, 4*4=16, so we get 15+(-2)+5. After that, we get 15-2+5=18

3 0

3 years ago