Question

find the product of (x+4y+z) (x-2y-2z)​

Answer 1

Answer:

x^2-8y^2-2z^2+2yx-zx-10yz

Answer 2

x(x-2y-2z) +4y(x-2y-2z) +z(x-2y-2z)

x^2-2xy-2zx+4xy-8y^2-8zy+zx-2zy-2z^2

x^2-8y^2-2z^2-2xy+4xy-2zx+zx-8yz-2yz

x^2-8y^2-2z^2+2xy-zx-10yz