Question

factorise:
x²-(x-z)²

Answer 1

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

Answer 2

${x}^{2} - ( {x}^{2} - 2xz \: + {z}^{2} ) \\ 2xz - {z}^{2}$