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Compute the value

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Retired Moderator
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Joined: 07 Jun 2014
Posts: 4803
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 171

Kudos [?]: 2926 [0], given: 394

Compute the value [#permalink] New post 29 Apr 2018, 00:14
Expert's post
00:00

Question Stats:

70% (00:22) correct 29% (00:24) wrong based on 48 sessions
\(\sqrt{81+9}\)

A. 9
B.10
C. \(3\sqrt{10}\)
D. 12
E. 30
[Reveal] Spoiler: OA

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Sandy
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1 KUDOS received
Manager
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Joined: 26 Jan 2018
Posts: 189
GRE 1: Q165 V156
Followers: 1

Kudos [?]: 132 [1] , given: 3

Re: Compute the value [#permalink] New post 04 May 2018, 04:22
1
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KUDOS
As there is + inside square, we cannot get the number our without adding them. 81+9 =90

Hence answer
GRE Instructor
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Joined: 10 Apr 2015
Posts: 3838
Followers: 149

Kudos [?]: 4499 [0], given: 69

Re: Compute the value [#permalink] New post 04 May 2018, 09:13
Expert's post
sandy wrote:
\(\sqrt{81+9}\)

A. 9
B.10
C. \(3\sqrt{10}\)
D. 12
E. 30


To simplify this expression, we'll use the following rule: √(ab) = (√a)(√b)

So, √(81 + 9) = √90
= √[(9)(10)]
= (√9)(√10)
= 3√10

Answer: C

Cheers,
Brent
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Brent Hanneson – Creator of greenlighttestprep.com
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Re: Compute the value   [#permalink] 04 May 2018, 09:13
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