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GRE Math Challenge #110 - square root of 5
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Updated on: 20 Feb 2020, 11:21
Updated on: 20 Feb 2020, 11:21
Expert Reply
00:00
Question Stats:
72% (00:16) correct
27% (00:19) wrong based on 137 sessions
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Quantity A |
Quantity B |
\((\sqrt{5} + \sqrt{5})^2\) |
20 |
A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.
Kudos for the right answer and explanation
Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Given Kudos: 136
Re: GRE Math Challenge #110
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11 May 2015, 07:22
11 May 2015, 07:22
sandy wrote:
Quantity A: \((\sqrt{5} + \sqrt{5})^2\)
Quantity B: 20
Quantity B: 20
Simplify the part in the brackets to get:
Quantity A: (2√5)²
Quantity B: 20
Expand to get:
Quantity A: (2√5)(2√5)
Quantity B: 20
Simplify:
Quantity A: (4)(5)
Quantity B: 20
Answer: C
Cheers,
Brent
Re: GRE Math Challenge #110 - square root of 5
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11 May 2018, 11:09
11 May 2018, 11:09
(a+b)^2 formula gives the answer.
