Question

expand using standard quantity (x-2y-z)^2​

Answer 1

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