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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).
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answered Probability: Find a value to make this equation hold true
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accepted Prove that set of all points on a sphere is uncountable