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Question

Consider the graph of a real-valued continuous function f(x) defined on R (the set of real numbers) as shown below.


The number of real solutions of the equation f(f(x))=4 is

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Solution

Put f(x)=t
Then, f(t)=4
t=2,0,4
Now, f(x)=2 for two values of x.
f(x)=0 for two values of x.
and f(x)=4 for three values of x.
Hence, the number of real solutions of the equation f(f(x))=4 is 7.

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