Trying to put this pattern into sigma notation -4, 9, -14, .....-44. Cant seem to find a pattern, I see its alternating sign wise, which must have something to do with even and odd powers.
2026-03-29 02:36:12.1774751772
Summation pattern of alternating signs
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It's easy by inspection $\sum_{n=1}(-1)^n(5n-1)$