(x-3) (x+7)=0. quadratic equations. chapter 5 grade ten
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(x-3)(x+7)=0
x²+7x-3x-21=0
x²+4x-21=0
x²+7x-3x-21=0
x(x+7)-3(x+7)=0
(x-3)(x+7)=0
x-3=0
x=3
x+7=0
x=-7
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