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Math Help - algebraic steps

  1. #1
    Newbie
    Joined
    Nov 2009
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    11

    Smile algebraic steps

    Hello, I cannot recall my algebra.
    how does this go from
    n(n+1)/2 +(n+1)

    to
    n(n+1) + 2(n+1)/2

    I'm missing a step in between. Can anyone show me? thank you.
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  2. #2
    Senior Member Stroodle's Avatar
    Joined
    Jun 2009
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    367
    Hi there.

    Do you mean:

    \frac{n(n+1)}{2}+(n+1) ?

    If so, you can't change it to n(n+1)+\frac{2(n+1)}{2}, as the first term is now different.

    You could however change it to \frac{n(n+1)}{2}+\frac{2(n+1)}{2}, as you are just multiplying the second term by \frac{2}{2} which equals 1.

    Hope this helps
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  3. #3
    Newbie
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    Nov 2009
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    Smile

    it does, thank you
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