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F of G function question - Square root inside a square root?

  1. Sep 12, 2012 #1
    1. The problem statement, all variables and given/known data

    The image has the question I don't quite understand!


    2. Relevant equations

    3. The attempt at a solution

    I understand how to get √(√2 - x) but I dont get how they end up with: 4√2 - x

    Last edited: Sep 12, 2012
  2. jcsd
  3. Sep 12, 2012 #2


    Staff: Mentor

    Your notation is incorrect. This is what you wrote:
    $$ \sqrt{\sqrt{2} - x}$$

    What you should have written is
    $$ \sqrt{\sqrt{2-x}}$$

    Without using LaTeX, as I did, you could have written √(√(2 - x))

    Do you see the difference?
  4. Sep 12, 2012 #3
    Ah yea, I see the difference. Gotta start writing in latex!

    I still dont understand the problem as I pointed out in the picture. ?
  5. Sep 12, 2012 #4


    Staff: Mentor

    Write the expression in exponent form rather than radical form.
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