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I have a question regarding some steps in a solution

  1. Sep 23, 2011 #1
    Question 1
    step 1
    =(2^n-1)/2^n + 1/2^(n+1)
    step 2
    =2(2^n-1)/2^(n+1) + 1/2^(n+1)
    step 3
    =2^(n +1)-2+1/2^(n+1)
    I don't know how steps 2 and 3 where achieved
    can someone please help me
     
  2. jcsd
  3. Sep 23, 2011 #2

    mathman

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    Step 2 is simply 1/2n = 2/2n+1.

    Step 3 doesn't look right. Could you clarify the expression?
     
  4. Sep 23, 2011 #3

    HallsofIvy

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    It would help if you told us what the problem is that this is supposed to be the solution to!
     
  5. Sep 24, 2011 #4
    2^(n +1) -2+1 / 2^(n+1)
    this just means that: 2 to the power of (n+1) -2+1 divided by 2 to the power of (n+1)
    the next step is
    2^(n +1) -1 / 2^(n+1)
     
  6. Sep 24, 2011 #5

    mathman

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    You need to put in parentheses. It is not clear what -2 and +1 relate to.
     
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