# How to?

1. Sep 12, 2006

### Nub

I dont get it...

For which value of x is each rational expression not defined?

a) 3/x

are you supposed to solve for x? or?

2. Sep 12, 2006

### HallsofIvy

Staff Emeritus
What if x= 0? Have you learned how to divide by 0?

3. Sep 13, 2006

### Robokapp

Wherever either the denominator turns into something you can't divide by (a.k.a zero) or some other operation becomes impossible, like a zero in a log or negative in a square root etc. Basically wherever the graph doesn't have a y-value for the x-value. in a 3/x you REALLY can tell. if you never looked at a rational function and you're used with the linears, it comes as a shock...:)

4. Sep 13, 2006

### lo2

Chuch Norris can divide by 0...Go ask him how to.

5. Sep 13, 2006

### HallsofIvy

Staff Emeritus
He can probably spell his own first name, too.

6. Sep 13, 2006

### lo2

Yeah probaly...

7. Sep 13, 2006

### Nub

Yeah i know how to do it now. Thanks anyways guys. Ill keep your site under favourites so if theres anything I'll be sure to give you guys a click