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Polynomial
A polynomial is a finite sum of the form
Explanation
A polynomial of degree n consists of any number of powers of a variable x, multiplied by the coefficient ak, where the terms are added.
The fundamental theorem of algebra says that this polynomial has n roots, which also may be complex.
Examples
Well-known examples are y = ax + b and y = ax2 + bx + c, where you will immediately see that the sequence is changed.