Question

Expand the cube:(2x-y+z)^2​

Answer 1

Answer:

Identity : $(x+y+z)^{2} = x^2 + y^2 + z^2 + 2xy + 2yz +2zx$

Solution : $(2x)^2 + (-y)^2 + (z)^2 + 2(2x)(-y) + 2(-y)(z) + 2(z)(2y)$

$= 4x^2 + y^2 + z^2 - 4xy - 2yz + 4zx$