diketahui g(x) = x^2 + 3x + 2 dan, (f o g)(x) = 4x^2 + 12x + 13 Tentukan rumus f(x)

fog(x) = 4x² + 12x + 13
f(x²+3x+2) = 4(x²+3x+2) + 5
f(x) = 4x + 5

g(x) = x^2 + 3x + 2 => kali 4
4g(x) = 4x^2 + 12x + 8

(f o g)(x) = 4x^2 + 12x + 13 ====> 13 nya di ubah jadi 8 + 5
f(g(x)) = 4x^2 + 12x + 8 + 5
f(g(x)) = 4(x^2 + 3x + 2) + 5
f(g(x)) = 4g(x) + 5
f(x) = 4x + 5