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8-84.
  1. Multiple Choice: f(x) = ex x3 + 3x2 − l0x changes concavity at x = ? Homework Help ✎

    1. −2.03

    2. −1.54

    3. 0.32

    4. 1.06

    5. 2.35

Concavity change might (or might not) happen where f''(x) = 0. Remember, you must confirm that concavity CHANGES at that candidate by detecting a sign change in the 2nd-derivative before and after the candidate, or by confirming that 3rd-derivative at the candidate is not equal to 0.