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Math Help - Sum

  1. #1
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    Sum

    I have no idea how to solve this

    20
    ∑ (i^3 + 3i^2 + 2i)
    i=1

    find the sum
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  2. #2
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    Quote Originally Posted by bookworm25 View Post
    I have no idea how to solve this

    20
    ∑ (i^3 + 3i^2 + 2i)
    i=1

    find the sum
    = \sum_{i = 1}^{20} i^3 + 3 \sum_{i = 1}^{20} i^2 + 2 \sum_{i = 1}^{20} i and each of the summations can be calculated using well known formulae eg. see here Some special sums
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