2r (z-x-y) and 2y (z-y -x) – InterviewSolution

1.	2r (z-x-y) and 2y (z-y -x)
Answer» 2x(z-x-y) + 2y(z-y-x) = 2x(z-x-y) + 2y(z-x-y) = (2x+2y)(z-x-y) = 2(x+y)(z-x-y)

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