how to solve this question
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use the identity
(a + b + c)^2 = a^2 + b^2 + c^2 + 2ab + 2bc + 2ac
(-x + 2y + z)^2
= (-x)^2 + (2y)^2 + z^2 + 2*(-x)*(2y) + 2*(2y)*(z) + 2*(-x)z
= x^2 + 4y^2 + z^2 - 4xy + 4yz - 2xz
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