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Challenge 25 (q37)

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Challenge 25 (q37) [#permalink] New post 07 Nov 2006, 05:24
Can't understand the expln? :?
q. 1/(2-sqrt(3))=?


sqrt(3) - 2
2 + sqrt(3)
sqrt(2) + sqrt(3)
2 - sqrt(3)
sqrt(3) + 4
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 [#permalink] New post 07 Nov 2006, 05:27
Multiple and divide numerator and denoiminator by 2+sqrt(3)

u get 2+sqrt(3)
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Re: Challenge 25 (q37) [#permalink] New post 07 Nov 2006, 08:59
choice b

multiply num and den with 2+Sqrt 3
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 [#permalink] New post 08 Nov 2006, 01:44
1/(2-sqrt3)
= 1/(2-sqrt3) * (2+sqrt3)/(2+sqrt3)
= 2+sqrt3/4 - 3
= 2+sqrt3
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Re: Challenge 25 (q37) [#permalink] New post 08 Nov 2006, 06:58
pawan82 wrote:
Can't understand the expln? :?
q. 1/(2-sqrt(3))=?


sqrt(3) - 2
2 + sqrt(3)
sqrt(2) + sqrt(3)
2 - sqrt(3)
sqrt(3) + 4


We are asked to find an easiest way to write the equation... to simplify it :)
Re: Challenge 25 (q37)   [#permalink] 08 Nov 2006, 06:58
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Challenge 25 (q37)

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