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If 8 < [(n+6)(n+1)]^(1/2) < 9, then n could equal

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Intern
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Joined: 08 Sep 2017
Posts: 6
Concentration: General Management, Strategy
GMAT 1: 640 Q47 V30
WE: Project Management (Consumer Products)
If 8 < [(n+6)(n+1)]^(1/2) < 9, then n could equal  [#permalink]

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New post 21 Jan 2018, 15:33
1
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

73% (01:14) correct 27% (01:47) wrong based on 78 sessions

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If \(8<\sqrt{(n+6)(n+1)}<9\), then n could equal

A. 5
B. 6
C. 7
D. 8
E. 9
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Joined: 26 Mar 2013
Posts: 1836
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Re: If 8 < [(n+6)(n+1)]^(1/2) < 9, then n could equal  [#permalink]

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New post 21 Jan 2018, 17:35
1
1
topaixao wrote:
If \(8<\sqrt{(n+6)(n+1)}<9\), then n could equal

A. 5
B. 6
C. 7
D. 8
E. 9



Square the inequality:

64 <(n+6)(n+1)<81

We can use the answers to test:

A: 5

64 <66<81

We can stop now

for check

B: 6

64 <12 *7<81.invalid

Answer: A
GMAT Club Bot
Re: If 8 < [(n+6)(n+1)]^(1/2) < 9, then n could equal &nbs [#permalink] 21 Jan 2018, 17:35
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If 8 < [(n+6)(n+1)]^(1/2) < 9, then n could equal

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