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Can some one please explain this to me

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Senior Manager
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Joined: 07 Feb 2008
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Can some one please explain this to me [#permalink] New post 15 Jun 2008, 11:45
Can someone please explain to me how you arrive at the answer
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Director
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Re: Can some one please explain this to me [#permalink] New post 15 Jun 2008, 12:29
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
Re: Can some one please explain this to me   [#permalink] 15 Jun 2008, 12:29
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