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# \root of 5^2

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\root of 5^2 [#permalink]  24 Jun 2018, 09:19
Expert's post
00:00

Question Stats:

72% (00:08) correct 27% (00:00) wrong based on 40 sessions
 Quantity A Quantity B $$\sqrt{5^2}$$ $$5 \sqrt{5}$$

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.
[Reveal] Spoiler: OA

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Re: \root of 5^2 [#permalink]  25 Jun 2018, 22:37
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Carcass wrote:
 Quantity A Quantity B $$\sqrt{5^2}$$ $$5 \sqrt{5}$$

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.

From the question we can predict statement 2 > statement 1

statement 1 = $$\sqrt{5^2}$$) = 5

Statement 2 = $$5 \sqrt{5}$$ = 5 * (integer >2) ; which is greater than 5
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Re: \root of 5^2 [#permalink]  27 Jun 2018, 17:10
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Carcass wrote:
 Quantity A Quantity B $$\sqrt{5^2}$$ $$5 \sqrt{5}$$

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.

$$\sqrt{5^2}$$<$$5 \sqrt{5}$$= $$\sqrt{5*25}$$=$$\sqrt{125}$$ -> B
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Re: \root of 5^2 [#permalink]  27 Jun 2018, 17:17
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Hi @carcass.

I wonder why I click on an option (A,B,C,D). The webpage does not indicate whether I'm wrong or correct. It is only after I reload the page that the result comes out. On gmatclub.com, immediately I chose an option, The result comes out.

I suggest that our site use MATHJAX so that we can enter mathematical symbols more easily and quickly.

I would like to suggest that we have an LIVE preview for any comment we are writing, just like that in https://math.stackexchange.com/. It gives us more control over what we are writing.

Best regards,
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Re: \root of 5^2 [#permalink]  28 Jun 2018, 01:20
Expert's post
Really great feedback. I have already been forwarding to the programmer.

Thank you so much.
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Re: \root of 5^2 [#permalink]  28 Jun 2018, 10:58
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Why the answer is not D. root 25 is equal to +/- 5, hence if we see + numbers surely B is greater but if we - numbers the answer reverses, so shouldn't it be D?
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Re: \root of 5^2 [#permalink]  28 Jun 2018, 12:16
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Expert's post
Prakratii wrote:
Why the answer is not D. root 25 is equal to +/- 5, hence if we see + numbers surely B is greater but if we - numbers the answer reverses, so shouldn't it be D?

The $$\sqrt{x}$$ symbol is always positive root. However if $$x^2=25$$ then x=+/- 5. When the symbol is written it means positive root of the number.
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Re: \root of 5^2 [#permalink]  29 Jun 2018, 18:12
okay got it, thank you.
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Re: \root of 5^2 [#permalink]  30 Jun 2018, 23:21
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Expert's post
leanhdung wrote:
Hi @carcass.

I wonder why I click on an option (A,B,C,D). The webpage does not indicate whether I'm wrong or correct. It is only after I reload the page that the result comes out. On gmatclub.com, immediately I chose an option, The result comes out.

I suggest that our site use MATHJAX so that we can enter mathematical symbols more easily and quickly.

I would like to suggest that we have an LIVE preview for any comment we are writing, just like that in https://math.stackexchange.com/. It gives us more control over what we are writing.

Best regards,

Thank you for the suggestions. There are explanations to this:
1. The GRE allows multiple options to answer questions. E.g. Some questions can have 8 options and 3 of them are correct. Thus the GRE prep Club timer works different from the GMAT Club Timer (though it looks very similar).

2. We do use Mathjax, but we have created some shortcuts to write it on the forum. Both GMAT Club and GRE Prep Club use MathJax.
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Re: \root of 5^2   [#permalink] 30 Jun 2018, 23:21
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