If z=x+iyz = x + iyz=x+iy, what is ∣z∣2|z|^2∣z∣2?
x2+y2x^2 + y^2x2+y2
x2−y2x^2 - y^2x2−y2
(x+y)2(x+y)^2(x+y)2
x2+y2\sqrt{x^2+y^2}x2+y2