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polynomial

A sum of terms like $a_n x^n + \dots + a_1 x + a_0$ , whole-number exponents only.

A polynomial in $x$ is an expression $a_n x^n + a_{n-1}x^{n-1} + \dots + a_1 x + a_0$ where $n$ is a nonnegative integer and $a_n \neq 0$ .