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when toggle format what by license comment
Dec 12, 2016 at 18:59 comment added Will Sawin @FanZheng Fixed.
Dec 12, 2016 at 18:59 history edited Will Sawin CC BY-SA 3.0
added 1 character in body
Dec 12, 2016 at 18:20 comment added Fan Zheng "$1+\sqrt2$ is sometimes positive and sometimes negative." This line made my day. BTW, isn't it $-b^2$ that is always negative?
Dec 12, 2016 at 17:42 history answered Will Sawin CC BY-SA 3.0