add : 2x(z-x-y) and 2y(z-y-x
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Step-by-step explanation:
= (2xz - 2x2 - 2xy) + (2yz - 2y2 - 2xy)
= 2xz - 2x2 - 2xy + 2yz - 2y2 - 2xy
= 2x2 - 2y2 + 2xz + 2yz - 2xy - 2xy
= 2x2 - 2y2 + 2xz + 2yz - 4xy
Hope you got it...
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