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Mathematics 20 Online
OpenStudy (anonymous):

Algebra ~

OpenStudy (anonymous):

OpenStudy (anonymous):

what do you think ?

OpenStudy (anonymous):

I think it's c

OpenStudy (anonymous):

no.. try to open the brackets ..

OpenStudy (anonymous):

It's a

OpenStudy (anonymous):

right .. in fact the form is (a-b)(a+b) = a^2-b^2 again ..

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