Diketahui g(x) = 3x – 2 dan (f o g)(x) = 9x2 – 6x + 4. Nilai f(4) = ... . A. 24 B. 28 C. 32 D. 40 E. 52

g(x) = 3x-2
fog(x) = 9x²-6x
f(3x-2) = 9x²-6x
misal a = 3x-2, 3x = a +2
x = ⅓a + ⅔
f(a) = 9(⅓a+⅔)² - 6(⅓a+⅔)
= 9(1/9a²+4/9a + 4/9) - 2a - 4
= a² + 4a + 4 - 2a - 4
= a² + 2a
f(x) = x² + 2x
f(4) = 4² + 2*4
= 16 + 8
= 24

jawaban = A
semoga membantu :)