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# Is 7^X > 100 ? (1) 7^(X+2) > 9800 (2) 7^2X > 100,00

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Intern
Joined: 06 May 2010
Posts: 10
Followers: 0

Kudos [?]: 5 [1] , given: 3

Is 7^X > 100 ? (1) 7^(X+2) > 9800 (2) 7^2X > 100,00 [#permalink]

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12 May 2010, 20:00
1
KUDOS
00:00

Difficulty:

(N/A)

Question Stats:

67% (02:38) correct 33% (00:00) wrong based on 1 sessions

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Is 7^X > 100 ?

(1) 7^(X+2) > 9800
(2) 7^2X > 100,00

Thanks
-H
Manager
Joined: 20 Apr 2010
Posts: 153
Location: I N D I A
Followers: 3

Kudos [?]: 19 [1] , given: 16

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12 May 2010, 21:15
1
KUDOS
1. 7^(x+2)> 9800

or 7^x * 7^2 > 9800
or 7^x > 9800 / 49
or 7^x > 200 ------> 7^x > 100

Therefore , sufficient.

2. 7^2X > 100,00

or (7^x)^2 > 10000
or (7^x)^2 - (100)^2 > 0 ----> a^2 - b^2 >0
implies 7^x > 100 or 7^x <-100

Therefore not sufficient.

Ans : A
Manager
Joined: 05 Jul 2008
Posts: 139
GMAT 1: Q V
GMAT 2: 740 Q51 V38
Followers: 2

Kudos [?]: 97 [1] , given: 40

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13 May 2010, 03:26
1
KUDOS
harikattamudi wrote:
Is 7^X > 100 ?

(1) 7^(X+2) > 9800
(2) 7^2X > 100,00

Thanks
-H

Is it D?
(1): suff
(2): (7^x)^2>100,00 so 7^x>100. 7^x cannot be negative
Manager
Joined: 09 Apr 2010
Posts: 79
Followers: 1

Kudos [?]: 54 [0], given: 3

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13 May 2010, 06:45
"7^x <-100"

ok this is not possibt because 7^x can not be negative
Manager
Joined: 20 Apr 2010
Posts: 153
Location: I N D I A
Followers: 3

Kudos [?]: 19 [0], given: 16

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14 May 2010, 00:59
yes agree.. thanks for correcting...
Manager
Joined: 16 Feb 2010
Posts: 187
Followers: 2

Kudos [?]: 16 [0], given: 14

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15 May 2010, 09:34
7^x cannot be -ive hence the ans is D
Re: DS   [#permalink] 15 May 2010, 09:34
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