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 Nov 10 awarded Notable Question Nov 2 awarded Famous Question Oct 15 awarded Notable Question Sep 21 awarded Popular Question Jul 19 awarded Yearling Jun 12 comment System of equations with complex numbers-circles nice solution. Though one of the tags is algebra precalculus, so I would think there must be an easier way. I think it definitely has to do with finding the midway point between the centers of two circles. Jun 12 comment System of equations with complex numbers-circles Gotcha. I was writing an answer solving those by letting $z=a+bi$. Jun 12 comment System of equations with complex numbers-circles Why do you need the original circle equations? Jun 11 accepted Using the definition of a concave function prove that $f(x)=4-x^2$ is concave (do not use derivative). Jun 11 revised Using the definition of a concave function prove that $f(x)=4-x^2$ is concave (do not use derivative). added 2 characters in body Mar 30 awarded Self-Learner Feb 15 awarded Popular Question Feb 3 awarded Popular Question Jan 16 answered Probability: Find a value to make this equation hold true Dec 20 awarded Constituent Dec 16 awarded Caucus Dec 11 awarded Popular Question Nov 7 awarded Popular Question Oct 22 awarded Notable Question Sep 24 awarded Autobiographer