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Math Help - I must be blind, simplication

  1. #1
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    I must be blind, simplication



    How does this finite sum formula of
    \frac{3(1-\frac{1}{2}^{11})}{1-\frac{1}{2}}
    Get simplified to...

    \frac{3(2^{11}-1)}{2^{10}}
    Its late ....
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  2. #2
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    Quote Originally Posted by RockHard View Post


    How does this finite sum formula of
    \frac{3(1-\frac{1}{2}^{11})}{1-\frac{1}{2}}
    Get simplified to...

    \frac{3(2^{11}-1)}{2^{10}}
    Its late ....
    Simplify denominator: 1 - 1/2 = 1/2. Now multiply numerator and denominator by 2^11.
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  3. #3
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    Ok, that make sense, thanks, however, how do you choose what to multiply the the fraction by and why? Sorry for the elementary questions, Ive been up for way to long,
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  4. #4
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    Quote Originally Posted by RockHard View Post
    Ok, that make sense, thanks, however, how do you choose what to multiply the the fraction by and why? Sorry for the elementary questions, Ive been up for way to long,
    Look at what the end result is meant to be. Get some sleep. It's a waste of time asking things that you'd be able to do if you weren't tired.
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  5. #5
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    Well what would the reason be if I had not seen the end result?
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  6. #6
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    Quote Originally Posted by RockHard View Post
    Well what would the reason be if I had not seen the end result?
    No reason. The end result is how someone decided they wanted the answer written as. Unless you're told otherwise, the answer can be left in any form you want.

    Thread closed.
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