F(x)= 2x-3 dan g(x)= x²+2x-3 tentukan gof(x) ?

gof(x)=g(f(x))
=g(2x-3)
=(2x-3)²+2(2x-3)-3
=4x²-6x-6x+9+4x-6-3
=4x²-12x+4x+9-9
=4x²-8x

Bab Fungsi

(g o f)(x)
= g(f(x))
= (2x - 3)² + 2(2x - 3) - 3
= (4x² - 6x - 6x + 9) + 4x - 6 - 3
= 4x² - 12x + 9 + 4x - 9
= 4x² - 8x