Question

Expand the following
(x-2y-z)^2

Answer 1

Answer:

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Answer 2

Answer:

Step-by-step explanation:

Using the identity (a-b-c)² = a²+b²+c²-2ab+2bc-2ca

(x-2y-z)²

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

= x²+4y²+z²-4xy+4yz-2zx