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Math Help - End of a simplification plroblem

  1. #1
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    End of a simplification plroblem

    Could someone please explain the step directly under "add the constants" at the bottom I'm not understanding how they arrived at the 9/20 fraction thank you


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    Last edited by eetrapnoel; June 22nd 2014 at 04:30 PM.
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  2. #2
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    Re: End of a simplification plroblem

    Quote Originally Posted by eetrapnoel View Post
    Could someone please explain the step directly under "add the constants" at the bottom I'm not understanding how they arrived at the 9/20 fraction thank you


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    This is just arithmetic

    $- \dfrac{3}{5} + \dfrac{21}{20} = - \dfrac{3}{5} * 1 + \dfrac{21}{20} = \dfrac{-3}{5} * \dfrac{4}{4} + \dfrac{21}{20} = \dfrac{4(-3)}{4 * 5} + \dfrac{21}{20} = \dfrac{-12}{20} + \dfrac{21}{20} =\dfrac{21 - 12}{20} = \dfrac{9}{20}.$
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