Khan/khan-exercises — Issue #7343: Parabola intuition 3 - Parabola Intuition 3 error
Author: KhanBugz
Created: 2011-11-30 14:00:49+00:00
State: open
Labels: chrome, other, win7

There is an error in Parabola Intuition 3. The parabola in question is y - 3/8 = -2(x-1/2)^2. The focus is at (1/2, 1/4). When the focus dot is put at this point, though, the reading for "Focus" at the right says (1, 1/4) instead of (1/2, 1/4).

[parabola_intuition_3.html?seed=11&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/parabola_intuition_3.html?seed=11&problem=0&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/parabola_intuition_3.html?seed=11&problem=0&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5B%5C%223%2F8%5C%22%2C%5C%22-2%5C%22%2C%5C%221%5C%22%2C%5C%220.5%5C%22%2C%5C%220.25%5C%22%2C%5C%220.5%5C%22%5D%22%2C27%5D%2C%5B%22correct-activity%22%2C%22%5B%5C%223%2F8%5C%22%2C%5C%22-2%5C%22%2C%5C%221%2F2%5C%22%2C%5C%220.5%5C%22%2C%5C%220.25%5C%22%2C%5C%220.5%5C%22%5D%22%2C62%5D%5D)

[["3/8","-2","1","0.5","0.25","0.5"],["3/8","-2","1/2","0.5","0.25","0.5"]]

Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.121 Safari/535.2

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