I agree with you, but not everything can be done pictorially. FWIW, an animation...

		dbaupp on Nov 14, 2013 \| parent \| context \| favorite \| on: How I faced my fears and learned to be good at mat... I agree with you, but not everything can be done pictorially. FWIW, an animation of the quadratic formula/completing the square: http://en.wikipedia.org/wiki/File:Completing_the_square.gif