Tolong kak butuh bgt skrg​

komposisi fungsi

g(x) = 2x + 6

a = 2x + 6

x = (a – 6)/2

(fog)(x) = 4x² + 22x + 18

f(2x + 6) = 4((a – 6)/2)² + 22(a – 6)/2 + 18

f(a) = (a – 6)² + 11(a – 6) + 18

f(a) = a² – 12a + 36 + 11a – 66 + 18

f(a) = a² – a -12

f(x) = x² – x – 12