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3-76.

Compare three different methods to find a derivative of . Homework Help ✎

  1. Use the definition of a derivative.

    Expand the numerator.

    Combine like terms to simplify the numerator.

    Factor out an .

    Simplify the fraction by 'cancelling out' the .

    Evaluate the limit as .

  2. Use the Power Rule. Does your answer agree with your answer from part (a)?

    If your answers do not agree, you probably made an Algebraic error in part (a).

  3. Use your graphing calculator to graph  for . Does the graph match that of your answer from part (a)?

    Sketch 

    also sketch the you found in part (a) and part (b).

    The two graphs should be close, but not identical since part (c) uses a finite value for .