Re: Distance between a point and y = ax^2 + bx + c


Please look at my article

Point-to-Parabola Distance Formula (sci.math, 2001
Oct. 26)
<http://groups.google.com/group/sci.math/msg/7bb95a504
5b04cc7>.

You might also look at the rest of the thread.

N.B. There was a mistake in the original article. I
had said that Cbrt
should denote the real cube root, but that does not
always exist. Later, I
corrected the error by saying

| Assuming x^(1/3) to give the principal cube root
of x,
|
| Cbrt(x) = Sign(x)*|x|^(1/3) if x is real
| = x^(1/3) otherwise.

David W. Cantrell

Thank you! I will. :-)
.