Second Derivative Test

AP Calculus AB· difficulty 2/5

Inflection points occur where

  • A

    f=0f = 0

  • B

    f=0f' = 0

  • C

    f(x)=0f''(x) = 0 always

  • D

    ff'' changes sign

    check_circle

Explanation

Inflection: concavity changes — ff'' changes sign (and ff continuous there).

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