Math - Calculus

Show that the equation x^3-15x+c=0 has at most one root in the interval [-2,2].

Perhaps Rolle's Theorem, Mean Value Theorem, or Intermediate Value Theorem hold clues? ...Other than simply using my TI-84, I have no idea how to accomplish this.

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asked by William
  1. See response:
    http://www.jiskha.com/display.cgi?id=1298948844

    posted by MathMate

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