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Found this in book

  1. Oct 20, 2012 #1
    prove

    [tex]\sqrt[3]{26+15\sqrt{3}} = 2 + \sqrt{3}[/tex]

    and
    [tex]\sqrt[3]{26-15\sqrt{3}} = 2 - \sqrt{3}[/tex]

    I am not sure how to do this
     
  2. jcsd
  3. Oct 20, 2012 #2

    phinds

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    Gold Member

    Uh, this is AWFULLY simple. What have you tried?
     
  4. Oct 20, 2012 #3
    to be honest I have no idea what to do
     
  5. Oct 20, 2012 #4

    phinds

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    Gold Member

    Well since one side is a cube root, how about you try cubing both sides.
     
  6. Oct 20, 2012 #5
    got it, yes extremely simple
     
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