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OpenStudy (anonymous):
Factor completely: xy + 4y − 2x − 8
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OpenStudy (callisto):
xy + 4y − 2x − 8 = y(x+4) -2(x+4) = (y-2)(x+4)
OpenStudy (callisto):
first take out common factor of the term consisting same variable, then, take out the common factor again
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