Khan/khan-exercises — Issue #4919: Derivatives 1 - ??
Author: KhanBugz
Created: 2011-10-24 20:35:56+00:00
State: open
Labels: chrome, win7

I put in the answer negative 3 (-3) and it marked it as wrong. Weird

[derivatives_1.html?seed=65&problem=quadratic](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/derivatives_1.html?seed=65&problem=quadratic&debug)

["--3","--3"]

Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/14.0.835.202 Safari/535.1

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