jika g(x)=3^x-1 tentukanlah nilai dari g^-1(81)

g(x) = 3^(x-1)
y = 3^(x-1)
x - 1 = ³log y
x = (³log y) + 1
g-¹(x) = (³log x) + 1
g-¹(81) = (³log 81) + 1
= (4) + 1
= 5