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

jawab

g(x) = x²  - 1
fog(x)= x⁴
f {g(x)}= x⁴
f{ x² - 1} = x⁴ 
f(4)= ..
x² - 1 = 4
x² = 5
x⁴ = 5²
x⁴ = 25
f(4) = 25