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Jadi f^-1(x) = ²logx
b) y = 2^(x+5) ⇔ x+ 5 = ²logy ⇔ x = ²logy - 5
Jadi f^-1(x) = ²logx - 5
c) y = ²log 3x
²log 2^y = ²log3 - ²log x
²logx = ²log3 - ²log2^y
= ²Log 3/2^y
x = 3/2^y
f^-1(x) = 3/2^y