Attachment 21201

I need help with example 5.4L. I can understand all the working steps but i don't understand how they get m1 and m2, which is the point of intersection of the two perpendicular tangent... Can anyone enlighten me?

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- Mar 19th 2011, 11:37 PMMichaelLightEllipse question
Attachment 21201

I need help with example 5.4L. I can understand all the working steps but i don't understand how they get m1 and m2, which is the point of intersection of the two perpendicular tangent... Can anyone enlighten me? - Mar 20th 2011, 02:09 AMprasum
we have a quadratic equation in m whose roots are m1 and m2 solving them we will get point of intersection