Question

f(x) is polynomial (x>0) f(x)+f(1/x)=f(x)f(1/x) and f(2)=-7
find f(3)?

Answer 1

sorry the english is confusing me.
'now the other one f(x)' , what other one ?

Answer 2

I think he means "another question". A nice one though.

Answer 3

yes it is another question
and i edited the question

Answer 4

@iGreen

Answer 5

@Zarkon @Callisto

Answer 6

So the conditions are
f(x)+f(1/x)=f(x)*f(1/x)
and f(2)=-7

Answer 7

what kind of function has this property
f(x) + f(y) = f(x) * f(y)

Answer 8

http://openstudy.com/study#/updates/547c7aa5e4b082a9810f7e13

Answer 9

here is the tip f(x) =1+x^n or 1-x^n