inequality problem =.=

• May 16th 2010, 11:12 AM
behindDkeys
inequality problem =.=
ok so my teacher gave me this problem:

x+1/x^2-x-2 > 0

actually the inequality sign is "greater than or equal to" i just dont know how to type it in

so how do i solve this you guys?
• May 16th 2010, 11:28 AM
running-gag
Quote:

Originally Posted by behindDkeys
ok so my teacher gave me this problem:

x+1/x^2-x-2 > 0

actually the inequality sign is "greater than or equal to" i just dont know how to type it in

so how do i solve this you guys?

Hi

Do you mean $\displaystyle \frac{x+1}{x^2-x-2} \geq 0$ ?

If so note that $\displaystyle x^2-x-2 = (x-2)(x+1)$
• May 16th 2010, 11:36 AM
behindDkeys
Quote:

Originally Posted by running-gag
Hi

Do you mean $\displaystyle \frac{x+1}{x^2-x-2} \geq 0$ ?

If so note that $\displaystyle x^2-x-2 = (x-2)(x+1)$

yes yes its that!!!!

hmmm then i can cancel out x+1 which leaves me with x-2 is greater than or equal to 0 right?

whats next to that?

coz i dont have y
• May 16th 2010, 12:08 PM
running-gag
Quote:

Originally Posted by behindDkeys
hmmm then i can cancel out x+1 which leaves me with x-2 is greater than or equal to 0 right?

Yes but 2 is a forbidden value because makes the denominator equal to 0
• May 16th 2010, 12:11 PM
behindDkeys
Quote:

Originally Posted by running-gag
Yes but 2 is a forbidden value because makes the denominator equal to 0

so then i put it to the other side making it x>2?
• May 17th 2010, 01:18 AM
running-gag
Quote:

Originally Posted by behindDkeys
so then i put it to the other side making it x>2?

Yes