Question

Diketahui f(x) = x pangkat2 - 2 dan g(x) =2x-1 tentukan:
a. (f o g) (x)
b. (g o f ) (x)

Answer 1

A. f(g(x)) = (2x-1)²
               = 4x² - 4x + 1

b. g(f(x)) = 2(x²) - 1
               = 2x² - 1

Answer 2

F(x) = x² - 2
g(x) = 2x-1

a. f [g(x)] = f (2x-1)
= (2x-1)² - 2
= 4x² -4x + 1 - 2
= 4x² - 4x - 1

b. g[f(x)] = g (x²-2)
= 2(x²-2) - 1
= 2x² - 4 - 1
=2x² -5