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Anonymous
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If you mean: (2x-7y)(x+y) then it is 2x squared -5xy -7y squared
y^2 + 7y + 12 = (y+4)(y+3)
y2+7y=18 y2+7y-18=0 (y+9)(y-2)=0 y=-9 & y=2
x = 7y x/7 = y
7y + 18 = 39 Therefore, 7y = 39 - 18 = 21 y = 21/7 y = 3