Khan/khan-exercises — Issue #14251: Quotient rule - incorrect answer
Author: KhanBugz
Created: 2012-02-20 22:01:41+00:00
State: open
Labels: firefox, win7, wrong-or-unclear

Reporter: joseph.o.carver@gmail.com

answer is:

[(-12x + 2x^-2)(e^x) + (-6x^2 - 2 - 2x^-1)(e^x)] / (e^x)^2

and comes up as such when checking the solution, but the radio button widget thinks the answer is:

[(-12x + 2x^-2)(e^x) + (-6x^2 - 2 - 2x^-1)(e^x)] / (-6x^2 - 2 - 2x^1)^2

[quotient_rule.html?seed=99&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/quotient_rule.html?seed=99&problem=0&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/quotient_rule.html?seed=99&problem=0&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5C%22%3Ccode%20style%3D%5C%5C%5C%22display%3A%20none%3B%5C%5C%5C%22%3E%5C%5C%5C%5Cdfrac%7B(-12x%2B2x%5E%7B-2%7D\)(e%5E%7Bx%7D\)%2B(e%5E%7Bx%7D\)(-6x%5E%7B2%7D-2-2x%5E%7B-1%7D\)%7D%7B(e%5E%7Bx%7D\)%5E2%7D%3C%2Fcode%3E%5C%22%22%2C59%5D%2C%5B%22hint-activity%22%2C%220%22%2C13%5D%2C%5B%22hint-activity%22%2C%220%22%2C16%5D%2C%5B%22hint-activity%22%2C%220%22%2C18%5D%2C%5B%22hint-activity%22%2C%220%22%2C19%5D%2C%5B%22hint-activity%22%2C%220%22%2C23%5D%2C%5B%22hint-activity%22%2C%220%22%2C23%5D%2C%5B%22incorrect-activity%22%2C%22%5C%22%3Ccode%20style%3D%5C%5C%5C%22display%3A%20none%3B%5C%5C%5C%22%3E%5C%5C%5C%5Cdfrac%7B(-12x%2B2x%5E%7B-2%7D\)(e%5E%7Bx%7D\)%2B(e%5E%7Bx%7D\)(-6x%5E%7B2%7D-2-2x%5E%7B-1%7D\)%7D%7B(e%5E%7Bx%7D\)%5E2%7D%3C%2Fcode%3E%5C%22%22%2C27%5D%5D)

["\\dfrac{(-12x+2x^{-2})(e^{x})+(e^{x})(-6x^{2}-2-2x^{-1})}{(e^{x})^2}","\\dfrac{(-12x+2x^{-2})(e^{x})+(e^{x})(-6x^{2}-2-2x^{-1})}{(e^{x})^2}"]

Mozilla/5.0 (Windows NT 6.1; WOW64; rv:10.0.2) Gecko/20100101 Firefox/10.0.2

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