Question

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

Answer 1

f(-3) = 14

Explanation:

f(-3) just means to fill in -3 for x.

2x^2 + 3x + 5

becomes

2(-3)^2 + 3(-3) + 5

Exponent first.

2(9) + 3(-3) + 5

Multiplication

18 + -9 + 5

Add.

14

Answer 2

-4

Explanation:

Answer: If f(x) = -x2 - 3x + 5, then the value of f(-3) is -4.