How do you solve a quadratic equation by factorising?
To solve a quadratic equation by factorising, first rearrange it so one side equals zero. Factorise the quadratic into two brackets. Then set each bracket equal to zero and solve. This works because a product is zero only when one of its factors is zero. Most quadratics have two solutions.
Formula
(x + a)(x + b) = 0, so x = −a or x = −b
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