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How do I know if a quadratic equation will have one, two, or no solutions

examine the discriminant

http://www.mathnstuff.com/math/spoken/here/2class/320/quadequ.htm

p=2a+2b solve for b

b=p-2a/2b

-5/7y -1/2y times 2/3 - 1/21y i do not know the steps

How to solve common monomial factor?

like this ex:

1.) x2y+x2y2=x2y

2.) 2a+2b

3.) 3b-9b2-12a

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