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### Zero product rule

The zero product rule states that
If the product of two or more expressions is zero, then either expression is equal to zero.
For example, if a * b = 0, then either a = 0 or b = 0.

The zero product rule is used to solve quadratic equations when you have factored them. An example is as follows:

x^2 + 3x + 2 = 0
(x + 1)(x + 2) = 0
either x + 1 = 0, then x = -1
or x + 2 = 0, then x = -2
Therefore we obtained the solution x = {-1, -2} for the quadratic equation x^2 + 3x + 2 = 0 by using the Zero Product Rule.