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# Solving Quadratic Equations by Factoring

Posted on 2011-03-17
Medium Priority
300 Views
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
0
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LVL 32

Accepted Solution

phoffric earned 2000 total points
ID: 35159532
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
0

Author Comment

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

ID: 35159682
Never mind. I think I got it. Thanks.
0

LVL 32

Expert Comment

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