Question

factories x^2+z^2-2xz

Answer 1

x^2+z^2-2xz
=x^2-2xz+z^2
=(x-z)^2
=(x-z)(x-z)

Answer 2

Hello friend,
x^2-2xz+z^2
=x^2-xz-xz+z^2
=x(x-z)-z(x-z)
=(x-z)(x-z)
=(x-z)^2
hope it helps