It is currently 18 Nov 2017, 01:53

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# If x is an integer, is 9^x + 9^-x = b? (1)3^x + 3^-x =

 post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
CEO
Joined: 15 Aug 2003
Posts: 3452

Kudos [?]: 924 [0], given: 781

If x is an integer, is 9^x + 9^-x = b? (1)3^x + 3^-x = [#permalink]

### Show Tags

22 Sep 2003, 15:34
00:00

Difficulty:

(N/A)

Question Stats:

25% (00:44) correct 75% (00:51) wrong based on 14 sessions

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If x is an integer, is 9^x + 9^-x = b?

(1)3^x + 3^-x = square root of b+2
(2) x>0

Kudos [?]: 924 [0], given: 781

Intern
Joined: 03 May 2003
Posts: 28

Kudos [?]: 1 [0], given: 0

### Show Tags

22 Sep 2003, 17:03
If x is an integer, is 9^x + 9^-x = b?

(1)3^x + 3^-x = square root of b+2
(2) x>0

(1)
(3)^x + 1/(3^x) = sqrb+2

square both sides and you get

9^x + 2 + 1/(9^x) = b + 2
subtract 2
and
9^x + 9^-x = b

so 1 is sufficient

(2) in suffient by itself

Therefore A is the answer

?

Kudos [?]: 1 [0], given: 0

My attempt   [#permalink] 22 Sep 2003, 17:03
Display posts from previous: Sort by

# If x is an integer, is 9^x + 9^-x = b? (1)3^x + 3^-x =

 post reply Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.