Page 20 - Bahan Ajar Matematika Dasar

13 y – 5 = x

x = y – 5

−1 (y) = y – 5

−1 (x) = x – 5

Contoh 2:

Diketahui f(x) = 2x – 1. Tentukan fungsi invers

nya!

Penyelesaian : f(x) = 2x – 1

y = 2x – 1

y + 1 = 2x +1 = x
2

x = +1

2

−1 (y) = +1
2

−1 (x) = +1
2

Invers dari fungsi komposisi

( ) −1 = ( −1 o −1 )(x)

( ) −1 = ( −1 o −1 )( )