SOLUTION: Express the sum 1x2 + 2x3 + 3x4 + 4x5 + ... + 10x11 in summation notation.

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Question 74355: Express the sum 1x2 + 2x3 + 3x4 + 4x5 + ... + 10x11 in summation notation.
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
sum%28+ix%5E%28i%2B1%29%2C+i=1%2C+n=10+%29
If we let i=1 and sum each consecutive ith term we get
1x%5E%281%2B1%29%2B2x%5E%281%2B2%29%2B3x%5E%283%2B1%29...9x%5E%289%2B1%29%2B10x%5E%2810%2B1%29
1x%5E2%2B2x%5E3%2B3x%5E4...9x%5E10%2B10x%5E11
Which shows that our summation works