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Solving Quadratic Equations by Factoring

Posted on 2011-03-17
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Last Modified: 2012-06-21
Example: Solve x^2=4 for x.

x^2=4
x^2-4=0
(x+2)(x-2)=0
x+2=0      or     x-2=0
    x=-2     or        x=2


How to solve this? Thanks.

9m=m^2
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Question by:kadin
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phoffric earned 500 total points
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9m=m^2   -->  m^2 - 9m = 0
Then factor out the m: m( m-9 ) =0

m = 0       or     m - 9 = 0
m = 0       or     m = 9
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Author Comment

by:kadin
ID: 35159643
Thanks. One more question. How do I plug the numbers into the original equation to verify both answers work?
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Author Comment

by:kadin
ID: 35159682
Never mind. I think I got it. Thanks.
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Expert Comment

by:phoffric
ID: 35159914
Good point about checking your work. I forgot to mention it.
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