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Please control my math homework! (It's done)

  1. Dec 31, 2008 #1
    Just wanted to control if i made my math homework correctly. Just one exercise. Made it on paper and scanned into computer. The task was to simplify.

    Here it is: http://img504.imageshack.us/img504/6669/mathexecisewq0.jpg

    Please check it before 5th Januar, because i have to show it to my teacher on monday next week.

    Thank you very very much!!!
    P.S sorry for my bad english
  2. jcsd
  3. Dec 31, 2008 #2
    At V)
    in the denominator:
    2.sqrt(x).(x+1).(1-x) = ?
    Should check your work there...

    Other than that, looks good :biggrin:!

    You should always post your math related questions to the other forum - Pre calculus one.

    Just wanted to control if i made my math homework correctly.
    should be
    Just wanted to "check" if i "did" my math homework correctly.
  4. Jan 1, 2009 #3
    Hmmm... i don't see where is the problem. Seems correct to me :rolleyes: :blushing:
    Can you please tell what is wrong there?
  5. Jan 1, 2009 #4
    [itex](x+1)(1-x) = x - x^2 + 1 - x = 1-x^2[/itex] ?
    Last edited: Jan 1, 2009
  6. Jan 1, 2009 #5
    Such a childish mistake from me :blushing:

    Well, thank you very much for your help rootX and snits !
  7. Jan 1, 2009 #6
  8. Jan 1, 2009 #7
    Since the task is to simplify you could probably simplify the final expression a bit more:

    [itex]\frac{x}{\sqrt{x}(x^2-1)} = \frac{x \cdot x^{-1/2}}{x^2-1} = \frac{\sqrt{x}}{x^2-1}[/itex]
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