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    Hi I need help asap!
    i can't solve this quadratic!!
    2. 6. 12. 20. 30. 42
    +4. +4. +4. +4. +4
    +2. +2. +2. +2


    i think it starts with n^2 but now I'm stuck!!! I'm GCSE btw
    please help!
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    It is a very nice sequence.

    The answer you are looking for is:

    n^2 - n

    o.e.

    n(n-1)
 
 
 
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Updated: May 10, 2015

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