A standard functions question

Let f(x) be a polynomial, such that
f(x).f(1/x)=f(x)+f(1/x), and f(3)= -26. find f(x).

1 Answers

Fn will be such tht,
f(x) = 1+xⁿ, or f(x) = 1-xⁿ .....see which fits.

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