(adsbygoogle = window.adsbygoogle || []).push({}); Need some help solving this algebra calculation - URGENT

How can I go from

((n^2+(n+1)^2)/4) + 3 [(1/6)n(n+1)(2n+1)] + 2 [(1/2)n(n+1)]

to this

(1/4)n(n+1)(n+2)(n+3)

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# Need some help solving this algebra calculation -

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