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Why is the absolute value only in the numerator here?

  1. May 22, 2015 #1
    11.8 - Page 20.png
     
  2. jcsd
  3. May 22, 2015 #2

    SammyS

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    Is b ever negative?
     
  4. May 22, 2015 #3
    haha

    so obvious

    thanks a bunch
     
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