# Homework Help: Easy Question

1. Feb 24, 2005

### thomasrules

find x:

$$1+8x^{-1}+15x^{-2}$$

I've got so far:

$$\frac{x^2+8x+15}{x^2}$$

Last edited: Feb 24, 2005
2. Feb 24, 2005

### vincentchan

find x for
$$1+8x^{-1}+15x^{-2}$$

and so far you got
$$\frac{x^2+8x+15}{x^2}$$

x can be anything, all real number, or even complex number.... apple, orange, banana.... just put what ever you want

3. Feb 24, 2005

### thomasrules

sorry :) LOL ....ya a banana.....ok just simplify

4. Feb 24, 2005

### Jameson

If they're asking for all real numbers of x, then x can be anything but zero. Otherwise, like vincentchan said, x can be anything, even complex.

5. Feb 24, 2005

### thomasrules

sorry :) LOL ....ya a banana.....ok just simplify.

6. Feb 24, 2005

### vincentchan

(x+3)(x+5)=x^2+8x+15

7. Feb 24, 2005

### thomasrules

vincent I know that but there is a x^2 underneath!

The answer in the book is

$$(1+\frac{5}{x})(1+\frac{3}{x})$$

8. Feb 24, 2005

### vincentchan

can you simplify from my solution to your text book's one?
(x+3)(x+5)/x^2=(1+3/x)(1+5/x)

9. Feb 24, 2005

### thomasrules

;) got it thanks mr.