Add: 2x (z - x - y) and 2y (z - y - x)

Answer: 2xz – 4xy + 2yz – 2x2 – 2y2

2x (z – x – y) and 2y(z – y – x)

2x (z – x – y) + 2y (z – y – x)

2x (z – x – y) + 2y (z – y – x) = (2x × z) – (2x × x) – (2x × y) + (2y × z) – (2y × y) – (2y × x)

2x (z – x – y) + 2y (z – y – x) = 2xz – 2x2 – 2xy + 2yz – 2y2 – 2yx

2x (z – x – y) + 2y (z – y – x) = 2xz – 4xy + 2yz – 2x2 – 2y2

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