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Square root

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Square root [#permalink]  14 Oct 2008, 23:12
$$sqrt(4x^2 + 4xy + y^2)$$

x=29
y=-15

dont know what the answer choices are, but am interested in seeing the approaches
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Re: Square root [#permalink]  14 Oct 2008, 23:27
In the absence of complete question it is difficult to take the approach.

Asuuming, it is a DS question, the expression will be sqrt[(2x + y)^2].

In order to get the value of expression, both x and y are required. Hence, C.
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Re: Square root [#permalink]  15 Oct 2008, 01:43
Is it a data sufficiency question? Please specify.
As scthakur posted before, if DS type question then answer is (c).
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Re: Square root [#permalink]  30 Oct 2008, 12:29
sorry, its a problem solving question
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Re: Square root [#permalink]  30 Oct 2008, 12:36
(2x+y)^2 = 43

Edit:(2x+y) = 43

Forgot to remove the square.
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Last edited by leonidas on 30 Oct 2008, 12:57, edited 1 time in total.
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Re: Square root [#permalink]  30 Oct 2008, 12:36
pmenon wrote:
$$sqrt(4x^2 + 4xy + y^2)$$

x=29
y=-15

dont know what the answer choices are, but am interested in seeing the approaches

"]$$sqrt(4x^2 + 4xy + y^2)$$
= 2x+y = 2*29-15 =43
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Re: Square root [#permalink]  31 Oct 2008, 13:30
i must be missing something really simple. can one of you bright folks break it down step by step ?
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Re: Square root [#permalink]  31 Oct 2008, 13:46
pmenon wrote:
i must be missing something really simple. can one of you bright folks break it down step by step ?

I mean is the given question a complete one? Source?
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Re: Square root [#permalink]  31 Oct 2008, 13:47
pmenon wrote:
i must be missing something really simple. can one of you bright folks break it down step by step ?

4x^2 + 4xy + y^2 = (2x + y)^2
Re: Square root   [#permalink] 31 Oct 2008, 13:47
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