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+6
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avatar+549 

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 of \(a+d\)?

This was asked before but the thread got locked and no one provided a soluton

 Jul 19, 2020
 #1
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If you try some cases, you'll find a + d = 1.

 Jul 19, 2020
 #2
avatar+549 
+6

that is the wrong answer, but it's ok! the answer is actually 0

 Jul 19, 2020

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