CBSE Class 9 Answered

A polynomial is a mathematical expression consisting of a sum of terms, each term including a variable or variables raised to a power and multiplied by a coefficient. The simplest polynomials have one variable.  A one-variable (univariate) polynomial of degree n has the following form:

a_nxⁿ + a_n-1xⁿ-1 + ... + a₂x² + a₁x¹ + a₀x⁰

where the a's represent the coefficients and x represents the variable.

Note: Every polynomial is an algebri expression but every alg. expression is not a polynomial.