15. Add 2x(z – x – y ) and 2y(z–y – x).
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Answer:
2x(z-x-y) + 2y(z-y-x)
=2xz-2x^2-2xy+2yz-2y^2-2xy
=2x^2-2y^2-4xy-2yz+2xz Ans.
Step-by-step explanation:
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