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## Help Kaplan 800

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kwhite Just gettin' started!
Joined
23 Dec 2011
Posted:
13 messages
Help Kaplan 800 Sat Feb 25, 2012 12:51 am
Elapsed Time: 00:00
• Lap #[LAPCOUNT] ([LAPTIME])
I posted this in the DS forum but i wasn't sure if anyone would see it there so ill leave this here as well if thats ok

What is the value of a - b?

1) a^2 - b^2 = 9

2) a^2 - 2ab + b^2 = 1

[Moderator Edit: Moved the post to a relevant forum - neelgandham]

I am really stumped and the book explanation isn't helping me at all. Going off of #1 a^2 - b^2 = 9 --> (a-b)(a+b)=9 Therefore:

can't we take (a-b) = 9?? or is my factoring just really off tonight??

OA = E

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sanju09 GMAT Instructor
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Sat Feb 25, 2012 5:45 am
kwhite wrote:
I posted this in the DS forum but i wasn't sure if anyone would see it there so ill leave this here as well if thats ok

What is the value of a - b?

1) a^2 - b^2 = 9

2) a^2 - 2ab + b^2 = 1

I am really stumped and the book explanation isn't helping me at all. Going off of #1 a^2 - b^2 = 9 --> (a-b)(a+b)=9 Therefore:

can't we take (a-b) = 9?? or is my factoring just really off tonight??

OA = E
I am chasing, don't worry...

http://www.beatthegmat.com/help-kaplan-800-t106976.html

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The laws of nature are but the mathematical thoughts of God. ~Euclid

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