Determining Concavity

AP Calculus AB· difficulty 3/5

Number of inflection points for f(x)=x5f(x) = x^5:

  • A

    22

  • B

    33

  • C

    00

  • D

    11

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Explanation

f=20x3f'' = 20 x^3 changes sign at x=0x = 0 — one inflection point.

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