Add the product: x(x + y – r), y(x – y + r),z(x – y – z)

1.	Add the product: x(x + y – r), y(x – y + r),z(x – y – z)
Answer» x(x + y – r) + y(x – y + r) + z(x – y – z) = x² + xy – xr + xy – y² + yr + zx – yz – z² = x² – y² – z² + 2xy – xr + yr + zx – yz

Answer»

x(x + y – r) + y(x – y + r) + z(x – y – z)

= x² + xy – xr + xy – y² + yr + zx – yz – z²

= x² – y² – z² + 2xy – xr + yr + zx – yz

Discussion