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OpenStudy (anonymous):
How to factor 3x^2 +20xy -7y^2 into (-x-7y)(y-3x)?
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OpenStudy (anonymous):
\[3x^2+20xy-7y^2\]
myininaya (myininaya):
hint -21=21(-1) and 20=21+(-1)
myininaya (myininaya):
so try to replace 20xy with 21xy-1xy and factor by grouping
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