Khan/khan-exercises — Issue #13459: Factoring difference of squares 1 - Legal factored expression is not recognized
Author: KhanBugz
Created: 2012-02-09 09:36:38+00:00
State: open
Labels: chrome, lion, other

Reporter: jensaxel@soegaard.net

This expression is considered
(x-9)*(x+9)
to be an incorrect answer,
where as
(x-9)(x+9)
is works fine.

[factoring_difference_of_squares_1.html?seed=60&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/factoring_difference_of_squares_1.html?seed=60&problem=0&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/factoring_difference_of_squares_1.html?seed=60&problem=0&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5B%5C%22(x-9\)*(x%2B9\)%5C%22%5D%22%2C14%5D%2C%5B%22correct-activity%22%2C%22%5B%5C%22(x-9\)(x%2B9\)%5C%22%5D%22%2C7%5D%5D)

[["(x-9)*(x+9)"],["(x-9)(x+9)"]]

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_2) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.46 Safari/535.11

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