How does $\frac{n(k^2-1)}{2}$ become $nk^2$? I'm sorry for the stupid question but I'm at wits end and I have no idea how to go about this. Context
Thanks
2026-04-04 04:37:47.1775277467
Simplify $\frac{n(k^2-1)}{2}$ to $ nk^2$
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