A bpolynomial/b is an expression with positive integer indices. An (n^th) degree polynomial is a polynomial with the highest power being (n).

For example:
[ul]liA second degree polynomial (quadratic) has the form (ax^2+bx+c, a\ne0)[/li]liA third degree polynomial (cubic) has the form (ax^3+bx2+cx+d, a\ne0)[/li]liA fourth degree polynomial (quartic) has the form (ax^{4+bx3+cx2+dx+e,} a\ne0)[/li]/ul