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Math radicals homework

  1. Mar 3, 2009 #1
    1. The problem statement, all variables and given/known data

    (square root of 3 + square root of 5)(square root of 3-square root of6)

    2. Relevant equations



    3. The attempt at a solution
    Im confused on what to multiply what with.
     
  2. jcsd
  3. Mar 3, 2009 #2
    Re: Radicals

    How would you multiply (x + y)(x - z) out?

    The Bob
     
  4. Mar 3, 2009 #3
    Re: Radicals

    I don't know but that's what I've gotten :
    [tex] (\sqrt{3}+\sqrt{5})(\sqrt{3}-\sqrt{6})=\sqrt{3}(\sqrt{3}-\sqrt{6})+\sqrt{5}(\sqrt{3}-\sqrt{6})=\\
    \sqrt{3}\cdot\sqrt{3}-\sqrt{3}\cdot\sqrt{6}+\sqrt{5}\cdot\sqrt{3}-\sqrt{5}\cdot\sqrt{6}=\\
    =-2.846882916[/tex]
     
  5. Mar 3, 2009 #4
    Re: Radicals

    Well that is a way to do it but you've not produced an 'accurate' answer by using surds. As this has been posted, Stratosphere what would you have done?

    The Bob
     
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