Khan/khan-exercises — Issue #14241: Parabola intuition 3 - Forced minus negative format
Author: KhanBugz
Created: 2012-02-20 20:06:54+00:00
State: open
Labels: firefox, hard, win7

I really wish this asked us to sign the x,y coordinates rather than express a positive as minus negative. My last 3 problems are solved correctly on paper but I messed up flipping the signs. It's very frustrating having to differentiate between a contextual trap and an error in understanding the problem when trying to grasp a new concept.

[parabola_intuition_3.html?seed=26&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/parabola_intuition_3.html?seed=26&problem=0&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/parabola_intuition_3.html?seed=26&problem=0&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5B%5C%223%2F8%5C%22%2C%5C%22-1%2F4%5C%22%2C%5C%221%2F2%5C%22%2C%5C%22-0.5%5C%22%2C%5C%22-0.625%5C%22%2C%5C%221.375%5C%22%5D%22%2C330%5D%2C%5B%22hint-activity%22%2C%220%22%2C4%5D%2C%5B%22hint-activity%22%2C%220%22%2C4%5D%2C%5B%22hint-activity%22%2C%220%22%2C4%5D%2C%5B%22hint-activity%22%2C%220%22%2C4%5D%2C%5B%22hint-activity%22%2C%220%22%2C4%5D%2C%5B%22hint-activity%22%2C%220%22%2C4%5D%2C%5B%22hint-activity%22%2C%220%22%2C5%5D%2C%5B%22hint-activity%22%2C%220%22%2C5%5D%2C%5B%22correct-activity%22%2C%22%5B%5C%223%2F8%5C%22%2C%5C%22-1%2F4%5C%22%2C%5C%22-1%2F2%5C%22%2C%5C%22-0.5%5C%22%2C%5C%22-0.625%5C%22%2C%5C%221.375%5C%22%5D%22%2C35%5D%5D)

[["3/8","-1/4","1/2","-0.5","-0.625","1.375"],["3/8","-1/4","-1/2","-0.5","-0.625","1.375"]]

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

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