SOLUTION: I know how to do these I really just need to be refreshed the question I am having trouble with is .5n(n+1)to the second power

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Question 128979: I know how to do these I really just need to be refreshed the question I am having trouble with is .5n(n+1)to the second power
Found 2 solutions by checkley71, MathLover1:
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
5N(N+1)^2
.5N(N^2+2N+1)
.5N^3+N^2+.5N

Answer by MathLover1(20850) About Me  (Show Source):