First slide
Functions (XII)
Question

The number of integers in the domain of function, satisfying f(x)+fx1=x3+1x, is ______.

Moderate
Solution

f(x)+f1x=x2+1x

 Replacing x by 1x, we get f1x+f(x)=1x2+x

or  1x2+x=x2+1xor  x1x=x21x2or  x1x=x1xx+1xor  x1xx+1x1=0

x=1x; x+1x=1 (rejected) 

 Hence, x=1 or 1

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