1.

Solve this (x-2y-z) ²​

Answer»

ANSWER:-

\bf \:Formula \: used:-

(a-b-c) ² = a² + b² + c² - 2AB + 2bc - 2ac

\bf \: Solution

(X-2y-z) ²

= x ² + (2y)² + z² - 2×x×2y + 2×2y×z - 2×x×z

= x² + 4y² + z² - 4xy + 4yz - 2xz



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