Question

Add the product x(x+y-r),y(x-y+r)and z(x-y-r)

Answer 1

x(x+y-r) + y(x-y+r) + z(x-y-r)
= x² +xy-xr+xy -y²+yr +xz -yz -rz
=x²-y² +2xy -xr +yr +xz-yz -rz

Answer 2

$\huge\tt{❥Answer}$

${x}^{2} + xy - rx + xy - {y}^{2} + ry + xz \\ - yz - {z}^{2} \\ {x}^{2} - {y}^{2} - {z}^{2} + 2 xy - rx + ry + xz \\ - yz \\ {x}^{2} - {y}^{2} - {z}^{2} + 2xy - r(x + y) + z \\ (x - y)$