Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Linear algebra question

  1. Nov 3, 2004 #1
    Let P=(9,-7,-1) and Q=(-5,-5,-5). The set of all points that are equidistant from P and Q are given by the equation __x + __y + __z + __ = 0.

    ^^The question!

    All I want to know is how to start this question. I thought I was supposed to find the equation of the normal to the center of PQ but that didnt work out. Thanks!
     
  2. jcsd
  3. Nov 3, 2004 #2

    Tom Mattson

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    You need to set up the distance formula twice. Once for the distance between point P and the point (x,y,z) and once for the distance between point Q and the point (x,y,z). And since (x,y,z) is equidistant from P and Q, you do..........what?
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook