Nomor 16 beserta jalannya

f(x) = 1/(x + 3)
y = 1/(x + 3)
x + 3 = 1/y
x = 1/y - 3
x = (1 - 3y)/y

f^-1 (x) = (1 - 3x)/x
5 = (1 - 3x)/x
5x = 1 - 3x
5x + 3x = 1
x = 1/8

Cara lain

f(x) = 1/(x + 3)

f^-1 (1/(x + 3)) = x = 5

x = 5 ---> 1/(x + 3) = 1/(5 + 3) = 1/8