2:05 Null Factor Law | How to use the Null Factor Law
Quick, clear explanation of how a product equalling zero lets you solve factorised quadratics.
The null factor law
Understand the null factor law
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5:41 The Null Factor Law - Solving Quadratic Equations, written in Factored Form
Solves quadratics already in factored form by setting each factor to zero, clearly worked.