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Homework Help: Graphing problem

  1. Mar 3, 2006 #1
    Sketch the graph, labelling the x-intercepts with exact values

    how do i work this equation out?

    y=x^4 - 3x^2 + 2
  2. jcsd
  3. Mar 3, 2006 #2
    This equation is known as a "biquadratic." It factors. If it helps, set a=x^2 and take a look at it again.

  4. Mar 3, 2006 #3
    thank you
    so the new equation would be
    a^2 - 3a + 2
    then use the rule 'completing the square'
  5. Mar 3, 2006 #4
    You could factor it using synthetic division. Once you find its factors, you can plot the points, test for sign changes, and sketch it as usual.
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