A text book that I'm reading has $k < -5$ as the solution for $k+5 > 0$. What I want to know is how this can be - why is it not $k > -5$?
Edit: looks like the text book's made a mistake.
A text book that I'm reading has $k < -5$ as the solution for $k+5 > 0$. What I want to know is how this can be - why is it not $k > -5$?
Edit: looks like the text book's made a mistake.
To get this question into the answered list:
The textbook made a mistake. Starting from $k+5>0$ we can add $-5$ to both sides, producing $k+5+(-5)>0+(-5).$ Because $5+(-5)=0$ and $0+(-5)=-5$, we have $k+0>-5.$ Finally, because $k+0=k$, we have $k>-5.$
Thus, the correct solution is $k>-5$, not $k<-5$.