Khan/khan-exercises — Issue #10646: Domain of a function - Domain of a function
Author: KhanBugz
Created: 2012-01-08 13:46:17+00:00
State: open
Labels: chrome, other, xp

Reporter: iyjiwa@intnet.mu

f(x)=Sq.Root 11-x Divided by
Sq.Root x-10
In the solution steps what is meant by
' So the bottom is undefined when xA , so we know x is greater or equal to 10
'Combining these three restrictions, we know that 10A+B'
Where do the A and B come from and further the sentences are incomplete
Please advise

[domain_of_a_function.html?seed=153&problem=sqrt-frac](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/domain_of_a_function.html?seed=153&problem=sqrt-frac&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/domain_of_a_function.html?seed=153&problem=sqrt-frac&debug&activity=%5B%5B%22correct-activity%22%2C%22%5C%22%3Ccode%20style%3D%5C%5C%5C%22display%3A%20none%3B%20%5C%5C%5C%22%3E%5C%5C%5C%5C%7B%20%5C%5C%5C%5C%2C%20x%20%5C%5C%5C%5Cin%20%5C%5C%5C%5CRR%20%5C%5C%5C%5Cmid%2010%26lt%3B%20x%20%5C%5C%5C%5Cleq11%5C%5C%5C%5C%2C%20%5C%5C%5C%5C%7D%3C%2Fcode%3E%5C%22%22%2C139%5D%5D)

["\\{ \\, x \\in \\RR \\mid 10< x \\leq11\\, \\}"]

Mozilla/5.0 (Windows NT 5.1) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.75 Safari/535.7

MathJax is loaded, ready, queue length: 0