tentukan rumus untuk fungsi g(x) bila diketahui f(x) = x+3 dan (gof)(x) = x^2 - 6x +9

f(x) = a = x + 3 ---> x = a - 3

g(f(x)) = x² - 6x + 9
g(a) = (x - 3)²
g(a) = (a - 3 - 3)²
g(a) = (a - 6)²
g(x) = (x - 6)²
g(x) = x² - 12x + 36 ✔