Penyederhanaan (x-y+z)²

(x-y+z)²=(x-y+z)(x-y+z)=x²-xy+xz-xy+y²-yz+xz-yz+z²=x²-xy-xy+xz+xz+y²-yz-yz+z²=x²-2xy+2xz+y²-2yz+z²
Jadi jawabannya x²-2xy+2xz+y²-2yz+z²
Maaf ya kalo salah