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8-64.

At which point(s) on the graph of at right, do the following situations occur?

  1. and are both positive

    Translation: slope of is positive AND  is concave up.

  2. and are both negative

    Refer to the hint in part (a).

  3. is positive and is negative

    Refer to the hint in part (a).

  4. is negative and is positive

    Points and .