so to find when a graph is concave up or down you can use the 2nd derivative rule, but what happends if we have f"(x) = -3(x^2 +3)/(X^2-9)^3(adsbygoogle = window.adsbygoogle || []).push({});

what im thinking is that we are looking for f"(x)=0 so x^2+3= O but that would give us x=(-3)^1/2...

any thoughts?

**Physics Forums - The Fusion of Science and Community**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# 2nd derivative rule

Loading...

Similar Threads for derivative rule | Date |
---|---|

I Why can we WLOG derive Simpson's rule over interval -1 to 1 | Nov 30, 2017 |

B Rule to integrate a function with respect to its derivative | Sep 10, 2017 |

I Derive the formula for gradient using chain rule | Jun 20, 2016 |

I Chain rule in a multi-variable function | May 7, 2016 |

Partial derivatives and chain rule? | Nov 20, 2015 |

**Physics Forums - The Fusion of Science and Community**