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    PreCalculus: Average Rate of Change.

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    Please show work/explain answer. Not sure how to approach this question. Help please.

    12) Find the average rate of change of the function: f(x) = (x + 1)2 between x = a and x = a + h

    Cannot figure out how to factor this equation to find zeros. Please help.
    23) Show that x = 3 is a zero for x3 ? x2 ? 11x + 15, and find all the other zeros

    Please see the attachment.

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    The expert examines the average rate of change for precalculus.