If f (x) = 3x2 - 2x + 5, find f (-2)

A) - 27

B) - 11

C) - 3

D) 21

Answer: D

Step-by-step explanation:

f (x) = 3x2 - 2x + 5

f (-2) = 3 * (-2) ^2 - 2 * (-2) + 5

f (-2) = 3*4 + 4 + 5

f (-2) = 12 + 4 + 5

f (-2) = 21

D

Step-by-step explanation:

You have to be careful that you treat 21 as special. It is the only positive number. As you do the problem, keep an eye on 21.

f (-2) = 3x^2 - 2x + 5 Put - 2 wherever you see an x

f (-2) = 3 (-2) ^2 - 2 (-2) + 5 Calculate the first term.

f (-2) = 3 (4) - 2 (-2) + 5 Remove the brackets of the second term

f (-2) = 12 + 4 + 5 Combine

f (-2) = 21