Nomor 15 Berserta jalannya

f(x) = y = (x + 2)/(3 - x)
kali silang
y(3 - x) = x + 2
3y - xy = x + 2
-x - xy = 2 - 3y
x(-1 - y) = 2 - 3y
x = (2 - 3y)/(-1 - y)
x = (3y - 2)/(y + 1)

f^-1 (x) = (3x - 2)/(x + 1)

Opsi : E