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sqrt(4n2) = 2n
4n2
when n = 0 it equals -25 when n = 1 it equals -36 when n = 2 it equals -39 etc
Yes. Any odd integer, k, is of the form 2n+1 where n is an integer. then k2 = (2n + 1)2 = 4n2 + 4n + 1. The first two terms are even so the three-term total must be odd.
5 x 16 + 4 x 9 = 80 + 36 = 116