x(x+y+z)+yz=x^2+xy+xz+yz=(x^2+xy)+(xz+yz)=x(x+y)+z(x+y)=(x+y)(x+z)
=x(x+y)+xz+yz=x(x+y)+z(x+y)=(x+y)(x+z)
x(x+y+z)+yz=x^2+xy+xz+yz=(x^2+xz)+(xy+yz)=x(x+z)+y(x+z)=(x+y)(x+z)
