expand by using sutable identity (2x-3y-z)^2
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Answer:
(a+b+c)²=a²+b²+c²+2ab+2bc+2ac
(2x-3y-z)²
(2x)²+(-3y)²+(-z)²+2(2x)(-3y)+2(-3y)(-z)+2(2x)(-z)
4x²+9y²+z²-12xy+6yz-4xz
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