college algebra problem

Question

Let M(x)=-x^3+8x^2-x+1.

Find M(-1). 

Simplify your answer. 

 

help is appreciated, thank you!

Answer 1

Hello, thank you for taking the time to post your question!

To solve this one you want to plug in x = -1 back into the M(x) expression

-(-1)^3 + 8(-1)^2 – (-1) + 1

= -(-1) + 8(1) + 1 + 1

= 1 + 8 + 1 + 1

=11

I hope that helps you get moving in a better direction on this type of question! Feel free to reach out if you have any additional questions beyond that :)

Answer 2

M(-1) means to evaluate M(x) when x=-1.

 

M(-1) = -(-1)³ + 8(-1)² - (-1) + 1

 

 

I leave it to you to complete the computation.