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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.

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    This is a difference of squares.

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    Use an area model and a Diamond Problem.

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    Not factorable. Why?

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    What is special about the first and third terms?

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    See part (b).

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    See part (a).
    Remember to factor completely.