Date: Tue, 8 Jul 1997 21:27:21 -0400

From: Alexander Bogomolny

Ronald:

Your equation is incorrect. Parabola's focus is at the point F(0, 1/2), right? The line through P and F is given by

(x-2t)/(2t) = (y-2t^{2})/(2t^{2}-.5)

4tx^{2} -2(4t^{2}-1)x - 4t = 0

with two roots: 2t and -1/(2t). So that your book is correct.

Best

Alexander Bogomolny

61199486 |