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Homework Help: Putting an equation in quadratic form

  1. Apr 28, 2010 #1
    1. The problem statement, all variables and given/known data

    Could someone please explain how to go about putting an equation in to quadratic form.

    2. Relevant equations

    3. The attempt at a solution

    I know it equals 7(x-z)^2 -2(y-5z)^2 +3z^2. dnt know how to get there though
  2. jcsd
  3. Apr 28, 2010 #2


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    Homework Helper

    Firstly look at [tex]7x^2-14xz[/tex]

    This becomes [tex]7(x^2-2xz)[/tex] and now you just need to complete the square on that factor. Remember to subtract whatever you added to complete the square.



    Now do this for the other two terms as well.
  4. Apr 28, 2010 #3
    Thanks that helped. I can do them now.
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