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Pre-Algebra
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OpenStudy (anonymous):
81x2 - 1
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OpenStudy (anonymous):
\[a^2-b^2 = (a-b)(a+b)\]
OpenStudy (anonymous):
Thank you so much
OpenStudy (anonymous):
you should memorize that it comes up alot
OpenStudy (anonymous):
Thanks for the tip:) I have actually seen that more than one time
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