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Homework Help: Have I done the quadratic equation correctly?

  1. Mar 5, 2010 #1
    x2 + 3x + 2 = 0

    (x + 1) (x + 2)

    so x = -1 or -2

    Is that right?
  2. jcsd
  3. Mar 5, 2010 #2


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    Homework Helper

    Yes. You can check if you factorized correctly by expanding your factors out.
    or... you can check if your answers are correct by substituting them into the quadratic.

    If the left-hand side is equal to the right-hand side, then you've found the correct values for x.
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