tolong ya menentukan fungsi komposisi

f(x) = 5x^2 + 3x - 1
g(x) = x + 1

Dit. (fog)(x)

(fog)(x)
= f(g(x))

f(x + 1) = 5 . (x + 1)^2 + 3(x + 1) - 1

(x + 1)^2
= (x + 1)(x + 1)
= x^2 + x + x + 1
= x^2 + 2x + 1

--------------
= 5(x^2 + 2x + 1) + 3(x + 1) - 1
= 5x^2 + 10x + 5 + 3x + 3 - 1
= 5x^2 + 13x + 7

Pilihan D