diketahui (fog)(x) = x²+4 dan g(x)=x - 1. tentukan rumus f(x)

Fungsi Komposisi

(fog)(x) = x²+4
g(x) = x-1

f(g(x)) = x² + 4
f(x-1) = x² + 4

mis :
x-1 = a
x = a + 1

f(a) = (a+1)²+4
f(a) = a² + 2a + 1 + 4
f(a) = a² + 2a + 5
f(x) = x² + 2x + 5