Tolong dibantu, Tentukan g(x) bila diketahui:gof(x)=18x²-12x+5.dan. f(x)=3x-1

Bab Fungsi Komposisi
Matematika SMA Kelas X

(gof) (x) = 18x² - 12x + 5
g (f(x)) = 18x² - 12x + 5
g (3x - 1) = 18x² - 12x + 5
g(3 . (x/3) - 1) = 18 . (x/3)² - 12 (x/3) + 5
g(x - 1) = 18 . x²/9 - 4x + 5
g(x + 1 - 1) = 2 (x + 1)² - 4 (x + 1) + 5
g(x) = 2 (x² + 2x + 1) - 4x - 4 + 5
g(x) = 2x² + 4x + 2 - 4x + 1
g(x) = 2x² + 3