Question

Diket f(x)=3 x -¹
tentukan fungsi invers f -¹(x)
dan tentukan f -¹(81)!

Answer 1

 f ( x ) = 3 / x ( x pangkat -1 = 1 / x )
Misal f ( x ) = y
y = 3 / x
x = 3 / y
f ^ -1 ( x ) = 3 / x ( Ini inversnya )

f ^ -1 ( 81 ) = 3 / 81
                 = 1 / 27

Answer 2

Y = 3/x
x = 3/y
f⁻¹(x) = 3/x
f⁻¹(81) = 3/81
= 1/27