Question

If f(x) = 3x2 + 7x − 8, then f(−3) = ?

I'm studying for the ACT and I'm trying to figure this out. I keep on getting 52 for my answer, but I've seen people say the answer is -2 . If anyone can go through the steps so that i could understand it, that would be awsome.

Answer 1

`f(-3)=-2`

Explanation:

`f(x)=3x^2+7x-8\\f(-3)=3(-3)^2+7(-3)-8\\f(-3)=3(9)-21-8\\f(-3)=27-21-8\\f(-3)=6-8\\f(-3)=-2`

Not exactly sure how you got 52, but make sure you do the multiplications and exponents for each term correctly when getting your answer as well as following order of operations.