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# 99,999^2 - 1^2 = A. 10^10 - 2 B. (10^5 2)2 C. 10^4(10^5 2)

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Manager
Joined: 03 Oct 2008
Posts: 61
99,999^2 - 1^2 = A. 10^10 - 2 B. (10^5 2)2 C. 10^4(10^5 2) [#permalink]

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07 Oct 2008, 07:45
99,999^2 - 1^2 =

A. 10^10 - 2
B. (10^5 – 2)2
C. 10^4(10^5 – 2)
D. 10^5(10^4 – 2)
E. 10^5(10^5 – 2)

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Retired Moderator
Joined: 05 Jul 2006
Posts: 1741

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07 Oct 2008, 10:02
albany09 wrote:
99,999^2 - 1^2 =

A. 10^10 - 2
B. (10^5 – 2)2
C. 10^4(10^5 – 2)
D. 10^5(10^4 – 2)
E. 10^5(10^5 – 2)

option E

99,999^2 - 1^2 = (99,999 - 1) (99,999+ 1) = (100,000-2)(100,000) = (10^5 -2)(10^5)
Intern
Joined: 15 Apr 2008
Posts: 38

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13 Oct 2008, 06:51
E.

99,999^2-1=(99,999+1)(99,999-1)=100,000.99,998=10^5(10^5-2)

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: math--exponent   [#permalink] 13 Oct 2008, 06:51
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# 99,999^2 - 1^2 = A. 10^10 - 2 B. (10^5 2)2 C. 10^4(10^5 2)

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