jika f(x)=3/x,x>0 dan g(x)=x², x€R maka (fog)¯¹(3)

jawab

f(x)=  3/x
g(x)= x²

fog(x) = f (g(x))
fog(x) = f (x²)
fog(x)= 3/x²

(fog)⁻¹(3) = x
fog(x)=  3
3/x² = 3
3x² = 3
x² = 1
x = 1 atau x = 1