+0

# Inverse Functions

+1
55
2
+184

If $f(x)=\frac{ax+b}{cx+d}, abcd\not=0$ and $f(f(x))=x$ for all $x$ in the domain of $f$, what is the value $a+d$?

May 3, 2021

#1
0

a + d = -1.

May 3, 2021
#2
+184
0

The answer was 0 but thanks.

May 3, 2021