Inequality help needed!

• Sep 14th 2009, 08:09 PM
BobbyJean
Inequality help needed!
I've tried and tried but I can't solve these two inequalities (Crying)

X^2 + X - 2 < 0

and:

5X - 2 > 0
• Sep 14th 2009, 08:15 PM
songoku
Hi BobbyJean

Are there 2 separate questions or just one question consists of 2 inequalities?

Anyway, can you fatorise X^2 + X - 2, then find the critical values, then find the range where X^2 + X - 2 < 0 :)
• Sep 14th 2009, 08:17 PM
VonNemo19
Quote:

Originally Posted by BobbyJean
I've tried and tried but I can't solve these two inequalities (Crying)

X^2 + X - 2 < 0

and:

5X - 2 > 0

1. factor

2. solve like an equation

Do you know how to factor?

EG \$\displaystyle x^2+3x+2>0\$

\$\displaystyle (x+2)(x+1)>0\$

This means that the only way the statement is true is if x is anything but in
\$\displaystyle [-2,-1]\$.
• Sep 14th 2009, 08:39 PM
BobbyJean
Quote:

Originally Posted by songoku
Hi BobbyJean

Are there 2 separate questions or just one question consists of 2 inequalities?

Anyway, can you fatorise X^2 + X - 2, then find the critical values, then find the range where X^2 + X - 2 < 0 :)

These are two separate questions and I can't solve them (Crying)
• Sep 14th 2009, 08:42 PM
songoku
Hi BobbyJean

Well, you've been given hints. First step, can you factorise X^2 + X - 2 ? :)
• Sep 14th 2009, 09:30 PM
BobbyJean
Quote:

Originally Posted by songoku
Hi BobbyJean

Well, you've been given hints. First step, can you factorise X^2 + X - 2 ? :)

No I can't (Crying)
• Sep 14th 2009, 09:59 PM
songoku
Hi BobbyJean

Maybe this will help :College Algebra Tutorial on Factoring Polynomials