jika g(x)=x-4 dan (f°g) (x) =x²-5x+2, fungsi f(x)

Langsung aja y

(fog)(x) = f{g(x)}
x² - 5x + 2 = f(x-4)

Misal
x - 4 = a
x = a+4

Soal menjadi →
f(a) = (a+4)² - 5(a + 4) + 2
f(a) = a² + 8a + 16 - 5a - 20 + 2
f(a) = a² + 3a - 2

f(x) = x² + 3x - 2

Semoga berguna +_+