Author : Mélissa I'd like to know what is a polynomial( the definition and an explication)? And is 7x a polynomial? and why? Hi Mélissa, First a couple of examples. 7 x  5 and x^{ 3}  5x^{ 2} + 2 ^{x + 3}/_{x} Definition: a_{n} x^{n} + a_{n1} x^{n1} + ... + a_{2} x^{2} + a_{1} x + a_{0} Where n is an integer and a_{n}, a_{n1},...,a_{0} are numbers. For example if n = 1, a_{1} = 7 and a_{0} = 0 then you get the expression 7x, so 7x is a polynomial. I hope this helps,Penny
