Khan/khan-exercises — Issue #11877: Compound inequalities - No video about eliminating "unnecessary" inequalities
Author: KhanBugz
Created: 2012-01-23 01:23:05+00:00
State: open
Labels: chrome, other, win7

Reporter: rjacobson@ymail.com

In this problem set, there are a number of inequalities that resolve to redundant solutions like "x > 1 OR x > 5." In these cases, there's only a single inequality for the answer, like "x > 1," because the "OR x > 5" part is superfluous.

However, none of the four videos on inequalities explain this concept -- about reducing two inequalities to a single inequality when one of them is redundant. Instead, all of the examples resolve to a "true" compound inequality, like "x < 1 OR X > 5."

Could Sal consider adding another short video that explains this concept?

[compound_inequalities.html?seed=133&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/compound_inequalities.html?seed=133&problem=0&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/compound_inequalities.html?seed=133&problem=0&debug&activity=%5B%5D)

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