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Hi folks, after researching and studying for the past 2 days on this, I am still unable to find a single darn answer! I feel pretty low because of this, so would appreciate any help you can give.
So this is my question:
Simplify the following summations to the form an3 +
bn2+cn. Give values for a, b and c for each question.
1.
2.
3.
4.
I know the answers to the first three can be built up from these:
But I have no clue actually how to get the answers, as I was only taught and shown how to use set formulas on a given sum, so for instance
would be n(n+1) over 2.I am stuck!
Even a link to a website which could help me understand this question a bit better would be much appreciated.
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