Question 242686
(5x-6y)(7y+8z)
Rearrange: 
-(6y-5x)(7y+8z)
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Multiply:
-[42y^2 + 48yz - 35yx - 40xz]
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-[42y^2 + (48z-35x)y - 40xz]
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= -42y^2 - (48z-35x)y + 40xz
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Cheers,
Stan H.