We're currently learning series and sigma notation
We've been given the formulas for $\sum_{k=1}^{n}k$, $\sum_{k=1}^{n}k^2$, and $\sum_{k=1}^{n}k^3$ plus the properties on how to break them apart etc, place the constant c in front and multiply by the resulting sum.
Now I've been given $\sum_{k=-1}^{5}k^2$ and I'm stuck because the formulas won't work for that. If k=2 I understand that I can do $\sum_{k=1}^{5}k^2 – \sum_{k=1}^{1}k^2$ but that same concept won't work when k=-1
Is there a formula to solve it or is it just a matter of multiplying it all out
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