# Math Help - limits

1. ## limits

How to I find a limit coming from either the left or right on a TI-89? I know how to use the limit command, but that doesnt specify a left or right approach.

2. Hello !
Originally Posted by leftyguitarjoe
How to I find a limit coming from either the left or right on a TI-89? I know how to use the limit command, but that doesnt specify a left or right approach.
In general, if you don't know the syntax for something, go to CATALOG and find the command. At the bottom, you should have some kind of short example.

For the limit, it is
Code:
EXPR,VAR,POINT[,DIRECTION]
If something is between [ ], it means it's not always mandatory to write it.

In your case (ok, I knew it lol, the beginning of my post was for general questions), it's, for example :
Code:
limit(1/x,x,0,1)
The direction is just that you put a number that is > (or <) to the point where you want the limit. If you want it another way, it's the starting point of x, which will go towards the limit point.

limit(1/x,x,0,1)
> $\infty$

limit(1/x,x,0,-1524654778797)
> $-\infty$

Got it ?