26. Diketahui fungsi f(x)=2x-1 dan g(x)=x+5, bila (fog)(x) = -15 maka nilai x adalah…

Penjelasan dengan langkah-langkah:

f(x) = 2x – 1

g(x) = x + 5

—Cari fungsi komposisi :

(fog)(x) = 2(x + 5) – 1

(fog)(x) = 2x + 10 – 1

(fog)(x) = 2x + 9

—Cari nilai x, dimana (fog)(x) = -15

2x + 9 = -15

2x = -15 + 9

2x = -24

x = -24/2

x = -12 Jawaban E