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OpenStudy (anonymous):
(3m+n)(3m-n) i need work shown step by step
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OpenStudy (bahrom7893):
This is (a-b)(a+b), aka difference of two squares
OpenStudy (bahrom7893):
9m^2-n^2
OpenStudy (campbell_st):
|dw:1332963719138:dw| a simply way is to use a grid, the like terms are on the diagonal and underlined. the answer is 9m^2 + 3mn - 3mn - n^2 which simplifies to 9m^2 - n^2
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