Question

Please please give the answer. simpify:x(x+y*+z) +y*(x+y+z) - z(x+y*)

Answer 1

$x^{2}+xy+xz+xy+y^{2}+yz-xz-yz$
= $x^{2}+2xy+y^{2}$
=$\huge(x+y)^{2}$