Guys please help i have like a whole exercise on these can someone please provide a working answear.

x^3+5x^2+2x-8/x^3-7x^2+7x+15<=0 <= means less then or equal to

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- Apr 20th 2012, 03:47 AMiFuuZeInequality
Guys please help i have like a whole exercise on these can someone please provide a working answear.

x^3+5x^2+2x-8/x^3-7x^2+7x+15<=0 <= means less then or equal to - Apr 20th 2012, 03:49 AMProve ItRe: Inequality
- Apr 20th 2012, 04:04 AMprincepsRe: Inequality
- Apr 20th 2012, 04:09 AMiFuuZeRe: Inequality
yep so you factorice the top and bottom now what we do procede....

- Apr 20th 2012, 04:12 AMProve ItRe: Inequality
- Apr 20th 2012, 04:14 AMprincepsRe: Inequality
- Apr 20th 2012, 04:18 AMa tutorRe: Inequality
- Apr 20th 2012, 04:41 AMProve ItRe: Inequality
- Apr 20th 2012, 04:48 AMa tutorRe: Inequality
- Apr 20th 2012, 04:56 AMiFuuZeRe: Inequality
guys i dont understand, its better if i visualise a worked example if any can do that it would fantastic

- Apr 20th 2012, 05:25 AMa tutorRe: Inequality
Sign changes occur whenever the sign of one factor changes.

This will happen at x= -4,-2,-1,1,3 and 5.

So check x<-4. Here all factors <0 so the expression is positive.

x<-4 positive

-4<x<-2 negative

-2<x<-1 positive

-1<x<1 negative

1<x<3 positive

3<x<5 negative

x>5 positive