Question

Expand the following (x-2y-z)²​

Answer 1

Answer:

(x-2y-z)^2=x^2+4y^2+z^2-4xy+4yz-2xz

Step-by-step explanation:

(x-2y-z)^2 by using identity (a+b+c)^2 identity

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

=x^2+4y^2+z^2-4xy+4yz-2xz