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A Simple Inequality Concept That is Giving Me Trouble

Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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by tdadic84 » Fri Nov 28, 2008 9:56 am
yes u can...

only switch the sign when u divide my a negative...
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by alexac2 » Sun Nov 30, 2008 3:25 pm
Interesting, thank you.
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by austin » Mon Dec 01, 2008 2:20 am
Alex,

-x < 2 => x> -2 (multiply or divide by negative sign on both sides will switch the inequality)

-x> -2 => x<2 (same rule)

-x<-2 => x>2 (same rule)

-x > 2 => x < -2 (same rule)
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by logitech » Mon Dec 01, 2008 2:34 am
lets see it with some numbers

-4 < -3

4 > 3


AHA sign changed, when we multiply both side with - 1

Or

3 > -7

-3 < 7

Hmmm

-6 < - 4


- 6 + 40 < - 4 + 40

34 < 36

Sign did not change!!!

-6 - 40 < -4 - 40

-46 < - 44

sign did not change

now lets divide this by +2

-23 < - 22

sign did not change, lets try it with -2

23 > 22

AHA sign changed!!


So whenever you multiply or divide by a negative number make sure to change the sign and remember this exercise!

Have Fun!
LGTCH
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