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GMAT Prep Radicals and Exponents operations question

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GMAT Prep Radicals and Exponents operations question [#permalink] New post 04 Oct 2009, 12:48
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0% (00:00) correct 0% (00:00) wrong based on 1 sessions
Can't figure out hwo to get this one to show up using html tags...

so i'll try it with text:

[(radical(9+radical(80)) + (radical(9-radical(80)) ] ^ 2 = ???
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Re: GMAT Prep Radicals and Exponents operations question [#permalink] New post 04 Oct 2009, 13:42
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The answer is 20.

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

= (\sqrt{9+\sqrt{80}} + \sqrt{9-\sqrt{80}})(\sqrt{9+\sqrt{80}} + \sqrt{9-\sqrt{80}})

= (9+\sqrt{80}) + 2\sqrt{9+\sqrt{80}}\sqrt{9-\sqrt{80}} + (9-\sqrt{80})

= 18 + 2\sqrt{9^2-\sqrt{80}^2}

= 18 + 2\sqrt{1}

= 20
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Re: GMAT Prep Radicals and Exponents operations question [#permalink] New post 07 Oct 2009, 20:45
Expert's post
Here is the code of the Math Tags:

Code:
The answer is [b]20[/b].

[m](\sqrt{9+\sqrt{80}} + \sqrt{9-\sqrt{80}})^2[/m]

[m]= (\sqrt{9+\sqrt{80}} + \sqrt{9-\sqrt{80}})(\sqrt{9+\sqrt{80}} + \sqrt{9-\sqrt{80}})[/m]

[m]= (9+\sqrt{80}) + 2\sqrt{9+\sqrt{80}}\sqrt{9-\sqrt{80}} + (9-\sqrt{80})[/m]

[m]= 18 + 2\sqrt{9^2-\sqrt{80}^2}[/m]

[m]= 18 + 2\sqrt{1}[/m]

[m]= 20[/m]

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Re: GMAT Prep Radicals and Exponents operations question [#permalink] New post 07 Oct 2009, 21:43
Agree with AKProdigy87....20 it is
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Re: GMAT Prep Radicals and Exponents operations question   [#permalink] 07 Oct 2009, 21:43
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