Quadratic Equations - The Most Common Mistake

Students regularly confuse the techniques for solving linear and quadratic equations. In this video I'll explain what to do and what to avoid when solving quadratic equations.

0:00 What is a Quadratic equation?
0:20 The mistake students make
1:41 What you should do
3:10 Why students make this mistake
4:40 Another version of this mistake
5:11 What you should have done

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Gary

[blackhole]

I still do not understand why the quadratic should be set to equal zero before factorizing?