dik : g(x)=x+3 fog(x)=2x2+12x+17 ditanyakan f(x)

(fog)(x) = 2x² + 12x + 17
g(x) = x + 3

(fog)(x) = 2x² +12x + 17
f(g(x)) = 2x² + 12x + 17
f(x + 3) = 2x² + 12x + 17
f(x + 3 - 3) = 2(x - 3)² + 12(x - 3) + 17
f(x) = 2(x² - 6x + 9) + 12x - 36 + 17
f(x) = 2x² -12x + 18 + 12x - 36 + 17
f(x) = 2x² - 1