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Mathematics 7 Online
OpenStudy (anonymous):

Multiply (7x+5y)(7x-5y)

OpenStudy (anonymous):

do you know difference of squares? (a+b)(a-b) = a^2 - b^2

OpenStudy (anonymous):

oh i know how to do that, thanks! i forget the formula thing!

OpenStudy (anonymous):

yw.. :)

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