Question

Diketahui (f°g) (x) = 4x-5 ; g(x) = 2x+1
ditanya : a. f(x)
b. jika f(a) = 4, carilah a

Answer 1

A. fog (x) = 4x - 5
     f (x) = f (g(x))
           = f (2x+1)
           = 4 (2x+1) - 5
           =8x + 4 -5
           = 8x-1
b. f(a) = 4
     f ( 8x-1) = 4
     f (a) = -8x + 5
     f (a) = 8x -5