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EMPOWERgmat PS Forum Expert - Ask Me Anything about PS and Math

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EMPOWERgmat Instructor
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Status: GMAT Assassin/Co-Founder
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Re: EMPOWERgmat PS Forum Expert - Ask Me Anything about PS and Math  [#permalink]

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New post 09 Aug 2019, 20:24
Hi Nums99,

I've posted an explanation for this question here:

https://gmatclub.com/forum/the-product- ... l#p2334197

GMAT assassins aren't born, they're made,
Rich
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Contact Rich at: Rich.C@empowergmat.com

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Rich Cohen

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EMPOWERgmat PS Forum Expert - Ask Me Anything about PS and Math  [#permalink]

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New post 31 Aug 2019, 02:49
Hi EMPOWERgmatRichC

I am very confused about this one inequality concept even though it is very simple

when they say x^>9
does it mean -3<x<3
or does it mean -3<x>3
please help this concept misunderstanding is leading me to make silly mistakes in easy answers
EMPOWERgmat Instructor
User avatar
V
Status: GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Joined: 19 Dec 2014
Posts: 15024
Location: United States (CA)
GMAT 1: 800 Q51 V49
GRE 1: Q170 V170
Re: EMPOWERgmat PS Forum Expert - Ask Me Anything about PS and Math  [#permalink]

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New post 31 Aug 2019, 14:48
1
Hi Nums99,

When you're dealing with a 'squared term', it's likely that you are going to have more than one type of answer.

For example, if X^2 = 16.... then X can be +4 or -4.

In that same way, when you're dealing with a 'squared term' and an inequality, you will likely have more than one 'group' of numbers that fits the inequality.

For example if Y^2 > 9.... then Y can be any number that is GREATER than 3 OR any number that is LESS than -3.
so...
X > 3 or X < -3

Those are two separate groups of numbers though (one is positive numbers, the other is negative numbers), so you would not write that as one 'big' inequality; it's two separate inequalities.

GMAT assassins aren't born, they're made,
Rich
_________________
760+: Learn What GMAT Assassins Do to Score at the Highest Levels
Contact Rich at: Rich.C@empowergmat.com

*****Select EMPOWERgmat Courses now include ALL 6 Official GMAC CATs!*****

Rich Cohen

Co-Founder & GMAT Assassin

Special Offer: Save $75 + GMAT Club Tests Free
  Official GMAT Exam Packs + 70 Pt. Improvement Guarantee
www.empowergmat.com/
GMAT Club Bot
Re: EMPOWERgmat PS Forum Expert - Ask Me Anything about PS and Math   [#permalink] 31 Aug 2019, 14:48

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