Question

If f(x) = x4 + 3x3 – x2 + 6, find f(-3).

Answer 1

-3

Explanation:

f(-3) means to replace all the x's in the function with -3.

(–3)4 + 3(–3)3 – (–3)2 + 6 = 81 + 3(–27) – (9) + 6 = 81 – 81 – 9 + 6 = –3

Answer 2

f(-3) = (-3)^4 + 3(-3)^3 - (-3)^2 +6
f(-3)= 81 -81 -9 +6
f(-3)= -3