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April 25, 2014

Homework Help: Algebra

Posted by Samantha on Tuesday, September 9, 2008 at 8:41pm.

I'm having trouble with inequalities. Basically my problem is about which way the sign goes. Here's an example..

X(X+1)>2

so then it becomes

X^2 + X>2

Correct? Then

X^2 + X - 2>0

then factor so it becomes

(X+2)(X-1)>0

And so I end up with X>-2 and X>1 as my answer, but the book says it should be X<-2. Why did the sign switch? I didn't divide by a negative did I? Can someone help me please?

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