why it is not polynomial (x-1)/(x+1)

Question

Urgent

Answer 1

(x-1)/(x+1) = 1 - 2/x+1

Answer 2

So power of polynomial cannot be in minus form. So its not a polynomial???
Am I right

Answer 3

a polynomial has only positive powers of the variables.
(x-1)/(x+1) is a rational function -- the ratio of two polynomials.

you could have learned all this by googling polynomial ...