(adsbygoogle = window.adsbygoogle || []).push({}); unknown integration "tricks" in a book

I have a physics book (Serway & Jewett, Physics for Scientists and Engineers, 6th Ed, Thomson 2004) and on p. 1326 there is an example in which the integration variable is changed from x to -x as in 'dx' to '-dx' but I have never seen this in a calculus textbook (I have Protter and Protter and also Stewart). They also reverse the order of the limits of integration and this changes the sign in front of the integral to positive. I have also never seen this in a calculus textbook. Can anyone enlighten me or point me to a book or website where I might find an explanation?

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

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!

# Unknown integration tricks in a book

Loading...

Similar Threads - Unknown integration tricks | Date |
---|---|

I Equation with two unknowns (old title: Einstein's Insanity) | Feb 9, 2018 |

I The concept of 'unknowns' in equations | Sep 1, 2016 |

Is it possible to calculate the unknowns in these equations? | Dec 13, 2015 |

Definable relationships between 4 variables with 2 equations | Nov 22, 2015 |

Solving an integration equation with unknown kernel | Jul 13, 2013 |

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