Question

if f(4x-15)=8x-27, find fof(2)

Answer 1

Step-by-step explanation:

f(4x-15)=8x-27.

Let y=4x-15, then x=(y+15)/4,

So f(y)=8(y+15)/4-27=2y+30-27=2y+3.

And f(x)=2x+3.

f(2)=4+3=7.

f(7)=14+3=17, so f(f(2))=17=f∘f(2).

Answer 2

Answer:

x=3

(4x-15) = 8x-27

-15+27= 8x-4x

12=4x

x=3