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Can some one please explain this to me

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Senior Manager
Senior Manager
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Joined: 07 Feb 2008
Posts: 310

Kudos [?]: 186 [0], given: 1

Can some one please explain this to me [#permalink]

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New post 15 Jun 2008, 12:45
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Can someone please explain to me how you arrive at the answer
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Kudos [?]: 186 [0], given: 1

Director
Director
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Joined: 14 Oct 2007
Posts: 751

Kudos [?]: 235 [0], given: 8

Location: Oxford
Schools: Oxford'10
Re: Can some one please explain this to me [#permalink]

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New post 15 Jun 2008, 13:29
Vavali wrote:
Can someone please explain to me how you arrive at the answer


\((\sqrt{9 + \sqrt{80}} + \sqrt{9-\sqrt{81}})^2\)

expanding out you get

\((9-\sqrt{80}) + (9+\sqrt{80}) + 2\sqrt{9+\sqrt{80}}\sqrt{9-\sqrt{80}}\)
simplify:
\(18 + 2\sqrt{(9+\sqrt{80})(9-\sqrt{80})}

= 18 + 2
=20\)

Kudos [?]: 235 [0], given: 8

Re: Can some one please explain this to me   [#permalink] 15 Jun 2008, 13:29
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