The **roots** of a polynomial in *x* are the values of *x* that, when we evaluate the polynomial at those values, we find 0. Think of it this way: there are two "0"s in the word "root." Fine, they're actually "o"s, but we won't tell anybody if you don't.

The polynomial *x*^{2} - 9 is 0 when evaluated at *x* = 3 or *x* = -3.

This means 3 and -3 are the roots of the polynomial *x*^{2} – 9.

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