Question

Jika f(x)=3 pangkat x-1, tentukan f pangkat -1 (81)

Answer 1

Fx = 3^(x-1)
(x-1)=3logfx
x=(3logfx) + 1
f pangkat -1(x) = (3logx) + 1
f pangkat -1(81) = (3log81) + 1 = 4+1 = 5