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This is the accepted version of the following article: [Eisenberg, T. (2015), Problems Section. School Science and Mathematics, 115: 377. doi: 10.1111/ssm.12141], which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1111/ssm.12141/abstract
CitationDiaz-Barrero, J.L. [Solution to the problem] 5371[: a lower bound for a sum of squares]. "School science and mathematics [en línia]", Novembre 2015, vol. 115, núm. 7, p. 377.
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