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GRE Prep Club Legend  Joined: 07 Jun 2014
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GRE 1: Q167 V156 WE: Business Development (Energy and Utilities)
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GRE Math Challenge #22- Solve 5x +13 = 31 [#permalink]
Expert's post 00:00

Question Stats: 79% (00:44) correct 20% (00:35) wrong based on 29 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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Sandy
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Re: GRE Math Challenge #22- Solve 5x +13 = 31 [#permalink]
x= 18/5
input 18/5 , get sqrt 49,ans is 7 GRE Instructor Joined: 10 Apr 2015
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Re: GRE Math Challenge #22- Solve 5x +13 = 31 [#permalink]
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Expert's post
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

Cheers,
Brent
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Brent Hanneson – Creator of greenlighttestprep.com Sign up for our free GRE Question of the Day emails Re: GRE Math Challenge #22- Solve 5x +13 = 31   [#permalink] 19 Jan 2018, 12:56
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