Khan/khan-exercises — Issue #14166: Chain rule 1 - Wrong answer in practice problem
Author: KhanBugz
Created: 2012-02-19 04:56:37+00:00
State: open
Labels: firefox, wrong-or-unclear, xp

The answer for this practice problem does not match any of the choices given. It says -3x^2. Your explanation agrees with me. Keep up the good work!

[chain_rule_1.html?seed=64&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/chain_rule_1.html?seed=64&problem=0&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/chain_rule_1.html?seed=64&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%5Cfrac%7B1%7D%7Bx%5E%7B3%7D%7D\)(-3x%5E%7B2%7D\)%3C%2Fcode%3E%5C%22%22%2C56%5D%2C%5B%22hint-activity%22%2C%220%22%2C18%5D%2C%5B%22hint-activity%22%2C%220%22%2C31%5D%2C%5B%22hint-activity%22%2C%220%22%2C42%5D%2C%5B%22hint-activity%22%2C%220%22%2C45%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%5Cfrac%7B1%7D%7Bx%5E%7B3%7D%7D\)(-3x%5E%7B2%7D\)%3C%2Fcode%3E%5C%22%22%2C63%5D%5D)

["(\\frac{1}{x^{3}})(-3x^{2})","(\\frac{1}{x^{3}})(-3x^{2})"]

Mozilla/5.0 (Windows NT 5.1; rv:10.0.2) Gecko/20100101 Firefox/10.0.2

MathJax is loaded, ready, queue length: 0