expand using standard quantity (x-2y-z)^2
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Answer:
( x - 2y - z )² = x² + 4y² + z² - 4xy + 4yz - 2xz
Step-by-step explanation:
( x - 2y - z )²
by using (a + b + c)² identity
= x² + (-2y)² + (-z)² + 2(x)(-2y) + 2(-2y)(-z) + 2(-z)(x)
= x² + 4y² + z² - 4xy + 4yz - 2xz
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