if m = ax , n=ay and a2 = (mynx)z then xyz =
m = ax, n = ay
and a2 = (my.nx)z = myz.nxz = (ax)yz.(ay)xz = axyz.axyz = a2xyz a2 = a2xyz comparing the powers
⇒ 2 = 2xyz
⇒ xyz = 1
Factorise : xy−ay−ax+a2+bx−ab