jika g(x)=x²-1 dan fungsi memenuhi (f o g)(x)=x⁴, maka f(4)= ...

Diketahui :
g(x) = x² - 1
(fog)(x) = x⁴

f(g(x)) = x⁴

Ditanya : f(4)

Jika
g(x) = 4
x² - 1 = 4
x² = 5

Maka
f(4) = x⁴
f(4) = (x²)²
f(4) = (5)²
f(4) = 25