Mathematics
By using standard formulae, expand the following:
(x - 2y - z)2
Expansions
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Answer
(x - 2y - z)2 = [(x) + (-2y) + (-z)]2
= (x)2 + (-2y)2 + (-z)2 + 2 [(x)(-2y) + (-2y)(-z) + (-z)(x)]
= x2 + 4y2 + z2 + 2[-2xy + 2yz - xz]
= x2 + 4y2 + z2 - 4xy + 4yz - 2xz
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