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OpenStudy (anonymous):
4m^2 + 3n^2 - 8(2m^2 - 9n^2)
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OpenStudy (unklerhaukus):
\[4m^2 + 3n^2 - 8(2m^2 - 9n^2)\]\[=4m^2 + 3n^2 -16m^2+72n^2\]\[=-12m^2+75n^2\]
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