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5+11+17+23 +... Find the sum of the 2n term of the series

plz help me show step

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clearly an arithmetic series with
a = 5 and d = 6

sum(2n) = (2n/2)(10 + (2n-1)(6))
= n(10 + 12n - 6)
= 4n + 12n^2

I don't understand

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