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Textbook error?

  1. Jun 1, 2007 #1
    I'm currently going through some questions and came across quadratic and linear simultaneous equations.

    Solve the equation: x + y = 1
    x^2 + y^2 = 16

    I am not interested in the question itself but rather the explanation the book gives me which says after a couple of steps shows the equation:

    2x^2 - 2x -15 = 0

    Then it tells me to divide the equation by 2 and says when you divide the equation by 2 you will get:

    x^2 - x - 15 = 0

    I'm confused because i thought the -15 would also have to divide by two...
    is it the book or am i missing something serious here?
  2. jcsd
  3. Jun 1, 2007 #2
    If the equation you have provided is right, then it is an error on the part of the author/editor/printer.
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