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GRE Math Challenge #22- Solve 5x +13 = 31

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GRE Math Challenge #22- Solve 5x +13 = 31 [#permalink] New post 07 Sep 2014, 06:37
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Question Stats:

76% (00:46) correct 24% (00:35) wrong based on 25 sessions
If 5x +13 = 31, what is the value of \(\sqrt{5x + 31}\) ?

A. \(\sqrt{13}\)

B. \(\sqrt{\frac{173}{5}}\)

C. \(7\)

D. \(13\)

E. \(169\)
[Reveal] Spoiler: OA

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Re: GRE Math Challenge #22- Solve 5x +13 = 31 [#permalink] New post 16 Jan 2018, 02:23
x= 18/5
input 18/5 , get sqrt 49,ans is 7
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Re: GRE Math Challenge #22- Solve 5x +13 = 31 [#permalink] New post 19 Jan 2018, 12:56
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sandy wrote:
If 5x + 13 = 31, what is the value of \(\sqrt{5x + 31}\) ?

A. \(\sqrt{13}\)

B. \(\sqrt{\frac{173}{5}}\)

C. \(7\)

D. \(13\)

E. \(169\)


Given: 5x + 13 = 31
Add 18 to both sides to get: 5x + 31 = 49

We want to determine the value of \(\sqrt{5x + 31}\)

√(5x + 31) = √(49)
= 7

Answer: C

Cheers,
Brent
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Re: GRE Math Challenge #22- Solve 5x +13 = 31   [#permalink] 19 Jan 2018, 12:56
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GRE Math Challenge #22- Solve 5x +13 = 31

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