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That would be because you did not use the absolute value in the denominator.I was using the base of the triangle as the origin.

In my original equations, I had got one of the points correct when I put it in Wolfram Alpha. I just don't see why I didn't get the other correct point.

In the original equation it was of the form ##(x^2)^{\frac 32}##, which is always positive. When you simplified it to ##x^3## it was wrong for negative x.