Dik h (x+2)=x2 + 2x maka h(x)

Fungsi Komposisi

h(x + 2)  = x² + 2x
x + 2 = a
x = a – 2

h(a) = (a – 2)² + 2(a – 2)
h(a) = a² – 4a + 2 + 2a – 4
h(a) = a² – 2a – 4
h(x) = x² – 2x – 4