Expand this (x+y-2z)^2
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Answer:
Step-by-step explanation:
= (-x+y+2z)(-x+y+2z)
= -x( -x+y+2z )+y(-x+y+2z)+2z(-x+y+2z)
= +x2-xy-2xz-yx+y2+2yz-2zx+2zy+4z2
= x2+y2+4z2-2xy-4zx+4zy
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