How do you find roots in Algebra?

We can find the roots of other polynomial functions by setting y = 0 and factoring. For example, y = x 3 -27 = (x - 3)(x 2 +3x 2 + 9) has one root (x = 3), because there is one value of x for which x - 3 = 0 and no values of x for which x 2 + 3x + 9 = 0 (the discriminant is negative).
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