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OpenStudy (anonymous):
need help : Factor completely x^2+7xy-144y^2
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OpenStudy (anonymous):
What are the factors of 144 1 * 144 2 * 72 3 * 46 4 * 36 6 * 24 8 * 18 9 * 16 12 * 12 Which pair subtracts to get you 7?
OpenStudy (nikvist):
\[x^2+7xy-144y^2=x^2+16xy-9xy-144y^2=\] \[=x(x+16y)-9y(x+16y)=(x+16y)(x-9y)\]
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