diketahui fungsi komposisi (fog)(x)=x*-6x+3 dan g(x)=x-1.rumus fungsi f(x)

fog(x) = x² - 6x + 3
f(x - 1) = x² - 6x + 3
misal p = x - 1
x = p + 1
f(p) = (p+1)² - 6(p+1) + 3
f(p) = p² + 2p + 1 - 6p - 6 - 3
f(p) = p² - 4p - 2
f(x) = x² - 4x - 2