help with algebra problem

• Feb 11th 2011, 07:39 PM
wwinston
help with algebra problem
!10x-7!>8 The solution of this inequality consists of one or more of the intervals
(-infinity,A) , (A,B) , and (B, Infinity) where A>B

!=absolute bars..couldnt find em on the computer

Find A = ?
Find B = ?
• Feb 11th 2011, 07:41 PM
Prove It
Hint: $\displaystyle |X| > a$ is equivalent to $\displaystyle X < -a$ and $\displaystyle X > a$.
• Feb 11th 2011, 07:44 PM
wwinston
Quote:

Originally Posted by Prove It
Hint: $\displaystyle |X| > a$ is equivalent to $\displaystyle X < -a$ and $\displaystyle X > a$.

i solved for x and i got x < -1/10 or x > 3/2

im just confused about what goes where
• Feb 11th 2011, 07:50 PM
Prove It
Quote:

Originally Posted by wwinston
i solved for x and i got x < -1/10 or x > 3/2

im just confused about what goes where

Correct. Now how can you write $\displaystyle x < -\frac{1}{10}$ using set notation?

How can you write $\displaystyle x > \frac{3}{2}$ using set notation?
• Feb 11th 2011, 07:53 PM
wwinston
This is a homework question for an online class.. infinity or -infinity does not work for A or B
• Feb 12th 2011, 04:51 AM
HallsofIvy
Quote:

Originally Posted by wwinston
This is a homework question for an online class.. infinity or -infinity does not work for A or B

And it certainly shouldn't! You were told to use the forms
"(-infinity,A) , (A,B) , and (B, Infinity) where A>B"
Which of the two numbers you got is larger?