Khan/khan-exercises — Issue #15363: Functions 3 - f(11) not correct
Author: KhanBugz
Created: 2012-03-04 17:59:14+00:00
State: open
Labels: firefox, win7, wrong-or-unclear

Reporter: ergo.j@hotmail.com

f(11)=−11(power of 2)+(−6)(11)−29
So,
-11*(-11)= +121(to my knowledge double negative equals positive)
-6*11= -66
we get:
121-66-29= 26.
For some reason it interprets -11 to the second power as -121. Which is incorrect according to my calculator.

[functions_3.html?seed=89&problem=1](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/functions_3.html?seed=89&problem=1&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/functions_3.html?seed=89&problem=1&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5C%2226%5C%22%22%2C84%5D%2C%5B%22hint-activity%22%2C%220%22%2C12%5D%2C%5B%22hint-activity%22%2C%220%22%2C12%5D%2C%5B%22hint-activity%22%2C%220%22%2C12%5D%2C%5B%22hint-activity%22%2C%220%22%2C12%5D%2C%5B%22hint-activity%22%2C%220%22%2C12%5D%2C%5B%22hint-activity%22%2C%220%22%2C13%5D%2C%5B%22hint-activity%22%2C%220%22%2C13%5D%2C%5B%22hint-activity%22%2C%220%22%2C13%5D%2C%5B%22hint-activity%22%2C%220%22%2C13%5D%2C%5B%22hint-activity%22%2C%220%22%2C16%5D%5D)

["26"]

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

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