Solving Quadratic Equations by Factoring

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
kadinAsked:
Who is Participating?

[Webinar] Streamline your web hosting managementRegister Today

x
 
phoffricConnect With a Mentor Commented:
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
 
kadinAuthor Commented:
Thanks. One more question. How do I plug the numbers into the original equation to verify both answers work?
0
 
kadinAuthor Commented:
Never mind. I think I got it. Thanks.
0
 
phoffricCommented:
Good point about checking your work. I forgot to mention it.
0
All Courses

From novice to tech pro — start learning today.