# Simplify fractions of polynomials

1. Dec 8, 2004

### aisha

Simplify (x+1)/(x-1) multiplied by (x+3)/(1-x^2) divided by (x+3)^2/(1-x)

Im not sure how to factor the 1-x^2 and what to do with 1-x

I dont know how to simplify this plz help someone.

The answer to this question is 1/(x-1)(x+3)
x cannot = 1,-1, and -3

2. Dec 8, 2004

### shmoe

Notice that 1-x^2 is a difference of squares.

3. Dec 8, 2004

### dextercioby

Put in the form:
$$\frac{(x+1)(x+3)(1-x)}{(x-1)(1-x)(1+x)(x+3)(x+3)}$$
Is it clearer now??

4. Dec 8, 2004

### aisha

THANKS YES ITS CRYSTAL CLEAR :tongue2: