## anonymous 3 years ago hi whats the domain of 2x^3+5x^2-7x all over x^2-1

1. anonymous

all you have to do is find the domain restriction. To do that, just equate x^2 - 1 to 0 then solve for x. got it?

2. campbell_st

just look at the denominator and find any discontinuitites

3. anonymous

yea and i gotta but it in connotation

4. anonymous

put

5. campbell_st

so you will have after a little factorising $\frac{2x^3 + 5x^2 - 7x}{(x - 1)(x + 1)}$ basically the discontinuity occurs when $x^2 -1 = 0$ to find the values of x factorised and then solve...