Ragib Zaman
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 Jan 4 awarded Nice Answer Aug 29 awarded Nice Answer Aug 16 awarded Yearling May 30 awarded Enlightened May 30 awarded Nice Answer May 8 awarded Guru Apr 18 awarded Enlightened Apr 18 awarded Nice Answer Apr 6 awarded Nice Answer Jan 31 awarded Guru Oct 24 awarded Enlightened Oct 24 awarded Nice Answer Sep 30 awarded Explainer Sep 29 awarded Nice Answer Sep 12 awarded Nice Answer Aug 31 awarded Nice Answer Aug 16 awarded Yearling Aug 1 answered Find 2 square numbers with certain distance Aug 1 comment How find the maximum of the value $x^2_{1}+x^2_{2}+\cdots+x^2_{2014}$ Tips: 1) First try the problem with $2014$ replaced with $3.$ 2) Interpret the condition $x_1+x_2+x_3=0$ as the $x_i$ lying in a plane, and you want to maximize $x_1^2+x_2^2+x_3^3$ -- the square of the distance between the plane and the origin. Use geometric ideas! Jul 31 comment The 3rd and 4th Critical Point? @Winther My bad. I'm clearly up too late.