Domain not checked out, please see inside...

[Aries]

(08-12-2015 02:46 PM)Arno K Wrote:  

(08-12-2015 02:31 PM)Aries Wrote:  The domain of the fractional inequality is D=R-{1}, hence x=1 MUST be excluded from its domain.
The answer is not correct at all, that's a serious mistake in fact !

Well, I do not think that it is not correct as I tend to simplify first, then we have (x-1)*(x+3)>=0 and the Primes answer is ok. But a real bug is the fact that it even does that with simplify set to "None", here it should exclude 1.
Arno

You may simplify first but the fraction remains, its domain is still there, it can't be ignored ;-)