Question

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

Answer 1

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?

Answer 2

just look at the denominator and find any discontinuitites

Answer 3

yea and i gotta but it in connotation

Answer 4

put

Answer 5

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...