Question

simplify. (x+y-2z)² - x²-y²-3z+4xy​

Answer 1

Answer:

x+y+2z)2−x2−y2+3z2+4xy

Distribute:

=x2+2xy+4xz+y2+4yz+4z2+−x2+−y2+3z2+4xy

Combine Like Terms:

=x2+2xy+4xz+y2+4yz+4z2+−x2+−y2+3z2+4xy

=(x2+−x2)+(2xy+4xy)+(4xz)+(y2+−y2)+(4yz)+(4z2+3z2)

=6xy+4xz+4yz+7z2

Answer