Question

Given f(x) = 4x4 + 5x3 – 15x2 – 45, find f(–3).

A)
f(–3) = 3


B)
f(–3) = 6


C)
f(–3) = 9


D)
f(–3) = 12

Answer 1

The answer is C.

Explanation:

Answer 2

C)

f(–3) = 9

Explanation:

Given f(x) = 4x^4 + 5x^3 – 15x^2 – 45

f(-3) means let x = -3

f(-3) = 4(-3)^4 +5(-3)^3 – 15(-3)^2 – 45

=4(81) +5(-27) -15(9) -45

= 324 - 135 - 135 -45

=9