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frac{1}{2 - \sqrt{3}} = ? * \sqrt{3} - 2 * 2 + \sqrt{3} *

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Senior Manager
Senior Manager
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Joined: 05 Oct 2008
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frac{1}{2 - \sqrt{3}} = ? * \sqrt{3} - 2 * 2 + \sqrt{3} * [#permalink] New post 18 Oct 2008, 23:46
\frac{1}{2 - \sqrt{3}} = ?



* \sqrt{3} - 2
* 2 + \sqrt{3}
* \sqrt{2} + \sqrt{3}
* 2 - \sqrt{3}
* \sqrt{3} + 4
VP
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Joined: 17 Jun 2008
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Re: Another exponents [#permalink] New post 18 Oct 2008, 23:51
study wrote:
\frac{1}{2 - \sqrt{3}} = ?



* \sqrt{3} - 2
* 2 + \sqrt{3}
* \sqrt{2} + \sqrt{3}
* 2 - \sqrt{3}
* \sqrt{3} + 4


IMO B
multiply numerator and dino by 2+sgrt3
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Its Now Or Never

Senior Manager
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Joined: 05 Oct 2008
Posts: 273
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Kudos [?]: 42 [0], given: 22

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Re: Another exponents [#permalink] New post 02 Nov 2008, 02:13
Can someone explain how do we get to the answer? Thanks.
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Re: Another exponents [#permalink] New post 02 Nov 2008, 02:23
1/(2-sqrt3) = 1/(2-sqrt3)*(2+sqrt3)/(2+sqrt3) = (2+sqrt3)/(4-3) = 2+sqrt3.
Re: Another exponents   [#permalink] 02 Nov 2008, 02:23
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frac{1}{2 - \sqrt{3}} = ? * \sqrt{3} - 2 * 2 + \sqrt{3} *

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