Question

разложите на множители (x+y-z)^2 -(x-y+z)^2= ???

Answer 1

(x+y-z-(x-y+z))(x+y-z+x-y+z)=(x-x+y+y-z-z)(x+x+y-y-z+z)=2x(2y-2z)=4x(y-z)