Square of ab or square of ab.

Let a=-5 and b=-0.5, then ab=2.5, ab =6.25, and ab is less than ab.

Let a=- 1 and b=-0.5, then ab=0.5, ab =0.25, and ab is greater than ab.

Let a=-2 and b=-0.5, then ab= 1, ab = 1, ab equals ab.