Khan/khan-exercises — Issue #13037: Chain rule 1 - maybe the answer is wrong or i did my math wrong
Author: KhanBugz
Created: 2012-02-03 23:44:07+00:00
State: open
Labels: ie8, ie9, win7, wrong-or-unclear

Reporter: rasul.14@buckeyemail.osu.edu

website says answer is: ((3(−5x^4 −2x^3 −x^2 −2x−2−6x^−1 ) 2 )(−20x^3 −6x^2 −2x−2+6x^−2 )

but i think the answer is: (3(−5x^4 −2x^3 −x^2 −2x−2−6x^−1 ) 2 )(−20x^3 −6x^2 −2x+6x^−2 )

i think the sites wrong because it didnt derive the -2. i shouldnt be in the answer because the derivative of -2 is 0.

[chain_rule_1.html?seed=40&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/chain_rule_1.html?seed=40&problem=0&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/chain_rule_1.html?seed=40&problem=0&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5C%22None%20of%20the%20above.%5C%22%22%2C118%5D%2C%5B%22hint-activity%22%2C%220%22%2C2%5D%2C%5B%22hint-activity%22%2C%220%22%2C2%5D%2C%5B%22hint-activity%22%2C%220%22%2C2%5D%2C%5B%22hint-activity%22%2C%220%22%2C2%5D%2C%5B%22correct-activity%22%2C%22%5C%22%3Ccode%20style%3D%5C%5C%5C%22display%3A%20none%3B%5C%5C%5C%22%3E(3(-5x%5E%7B4%7D-2x%5E%7B3%7D-x%5E%7B2%7D-2x-2-6x%5E%7B-1%7D\)%5E%7B2%7D\)(-20x%5E%7B3%7D-6x%5E%7B2%7D-2x-2%2B6x%5E%7B-2%7D\)%3C%2Fcode%3E%5C%22%22%2C50%5D%5D)

["None of the above.","(3(-5x^{4}-2x^{3}-x^{2}-2x-2-6x^{-1})^{2})(-20x^{3}-6x^{2}-2x-2+6x^{-2})"]

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