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Homework Help: Linear Algebra Question

  1. Feb 9, 2008 #1
    Linear Algebra Question....

    So, the professor assigned this problem even though the book never touches on it whatsoever. I have no clud how to do it, so I would appreciate if anyone can describe the process of demonstrate.

    Q. Find the polynomial of degree 2 whose graph goes through points (1,-1), (2,3), and (3,13).

    Thank you for the help!
  2. jcsd
  3. Feb 9, 2008 #2


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    A polynomial of degree 2 is a*x^2+b*x+c=y. Substitute your three points and you get three linear equation in the variables a,b,c. Solve the system.
  4. Feb 9, 2008 #3
    See the section where it talks about AX = 0, and about homogeneous trivial solutions (or non-trivial).
    I strongly think that it would have something about this question in that section.
  5. Feb 9, 2008 #4
    Dick, I think you got it...I will try it.

    Should I solve for it by making it in rref ?
    Last edited: Feb 9, 2008
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