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4-85.

Factor each expression, if possible. Identify any special cases, such as a difference of squares or a perfect square trinomial. Homework Help ✎

  1. This is a difference of squares.

  1. Use an area model and a Diamond Problem.

  1. Not factorable. Why?

  1. What is special about the first and third terms?

  1. See part (b).

  1. See part (a).
    Remember to factor completely.