How do I get Wolfram Alpha to plot these things<p><a href="http://www-groups.dcs.st-and.ac.uk/~history/Curves/Newtons.html" rel="nofollow">http://www-groups.dcs.st-and.ac.uk/~history/Curves/Newtons.h...</a><p><a href="http://www.wolframalpha.com/input/?i=%7Ba+y%5E2+%3D+x+%28x%5E2-2+b+x%2Bc%29%2Ca%3E0%7D" rel="nofollow">http://www.wolframalpha.com/input/?i=%7Ba+y%5E2+%3D+x+%28x%5...</a>