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If s > 0 and (r/s)^1/2=s, what what is r in terms of s ?

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If s > 0 and (r/s)^1/2=s, what what is r in terms of s ? [#permalink]

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New post 12 Dec 2012, 08:32
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If s > 0 and \(\sqrt{\frac{r}{s}}=s\), what is r in terms of s ?

(A) 1/s
(B) \(\sqrt{s}\)
(C) \(s\sqrt{s}\)
(D) s^3
(E) s^2-s
[Reveal] Spoiler: OA
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Re: If s > 0 and (r/s)^1/2=s, what what is r in terms of s ? [#permalink]

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Re: If s > 0 and (r/s)^1/2=s, what what is r in terms of s ? [#permalink]

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Re: If s > 0 and (r/s)^1/2=s, what what is r in terms of s ? [#permalink]

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New post 24 Jan 2015, 19:05
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Hi All,

This question can be solved by TESTing VALUES. The key is to keep the values relatively small and think about how the square root sign impacts the math:

We're told that S > 0 and (r/s)^1/2=s

We're asked for the value of R.

IF....
R = 8
S = 2
\sqrt{4} = 2

So we're looking for an answer that = 8 when S = 2....

Answer A: 1/2 NOT a match
Answer B: \sqrt{2} NOT a match
Answer C: 2\sqrt{2} NOT a match
Answer D: 2^3 = 8 This IS a MATCH
Answer E: 2^2 - 2 = 2 NOT a match

Final Answer:
[Reveal] Spoiler:
D


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Re: If s > 0 and (r/s)^1/2=s, what what is r in terms of s ? [#permalink]

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New post 11 Jun 2016, 06:41
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Walkabout wrote:
If s > 0 and \(\sqrt{\frac{r}{s}}=s\), what is r in terms of s ?

(A) 1/s
(B) \(\sqrt{s}\)
(C) \(s\sqrt{s}\)
(D) s^3
(E) s^2-s


To solve, we need to simplify the equation √(r/s) = s.

We first want to eliminate the square root, so we square both sides, obtaining:

(√(r/s))^2 = s^2

r/s = s^2

To isolate r, we multiply the entire equation by s and we get:

r = s^3

The answer is D.
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Re: If s > 0 and (r/s)^1/2=s, what what is r in terms of s ? [#permalink]

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New post 12 Jun 2016, 05:10
Walkabout wrote:
If s > 0 and \(\sqrt{\frac{r}{s}}=s\), what is r in terms of s ?

(A) 1/s
(B) \(\sqrt{s}\)
(C) \(s\sqrt{s}\)
(D) s^3
(E) s^2-s


An alternate method will be testing the options , except (D) none follows -

\(\sqrt{\frac{s^3}{s}}=\sqrt{s^2}\) = \(s\)
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Re: If s > 0 and (r/s)^1/2=s, what what is r in terms of s ? [#permalink]

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New post 25 Mar 2017, 11:49
let's pick smart numbers and solve: let s be 3, then r is 27
if we test the answers D is the only that works
Re: If s > 0 and (r/s)^1/2=s, what what is r in terms of s ?   [#permalink] 25 Mar 2017, 11:49
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