I'm doing a calc BC practice exam and I found this question that stumps me to the max:(adsbygoogle = window.adsbygoogle || []).push({});

The function y=x^4+bx^2+8x+1 has a horizontal tangent and a point of inflection for the same value of x. What must be the value of b?

I know that points of inflection are found from the second derivative and setting that function to zero, however the 'b' value really throws me off :yuck:

Oh btw here are the mc answers.

a) -6 b)-1 c) 1 d) 4 e) 6

**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!

# Calc BC Exam Question

Loading...

Similar Threads - Calc Exam Question | Date |
---|---|

Question about area between curves (integral calc textbook q | Aug 4, 2017 |

I Which topics from precalc are essential for calc 3? | Jan 13, 2017 |

I Partial derivative used in Calc of Variation | Sep 11, 2016 |

Calc III Double Integral Question | Feb 29, 2016 |

Calc 1 practice exam question -- finding the y intercept of the tangent line | Oct 13, 2015 |

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