If f (x) = x3 + 4x and g (x) = - 2x + 1, then f (g (3)) = ?

Question

Mathematics

Willie Mathews

15 September, 14:13

If f (x) = x3 + 4x and g (x) = - 2x + 1, then f (g (3)) = ?

+4

Answers (2)

Know the Answer?

Jalen Jefferson · Answer 1

Answer:-3

Step-by-step explanation:

First find g (3).

So g (3) = - 2 (3) + 1 so g (3) = - 5

now plug this value into f (x).

f (-5) = (-5) 3 + 4 (3) = - 15+12 = - 3

Charlie Ochoa · Answer 2

- 145

Step-by-step explanation:

To evaluate f (g (3)), evaluate g (3) then substitute the result into f (x)

g (3) = - 2 (3) + 1 = - 6 + 1 = - 5, then

f ( - 5) = ( - 5) ³ + 4 ( - 5) = - 125 - 20 = - 145