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# This one is kinda simple, but I got stuck in the middle with

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Senior Manager
Joined: 05 Jun 2005
Posts: 449
This one is kinda simple, but I got stuck in the middle with [#permalink]

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01 Oct 2006, 20:29
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This one is kinda simple, but I got stuck in the middle with the radicals with the 2ab part

I applied the formula of (a+b)^2

end got to 18 + 2 ab, where a is the first radical and b is the second one. Please explain
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Manager
Joined: 26 Aug 2006
Posts: 67
Location: BeanTown

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01 Oct 2006, 20:41
Hi uvs...

Use the sqrt(A) x sqrt(B) = sqrt (AxB) method for the middle part.

BTW, is the answer E?
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Senior Manager
Joined: 31 Jul 2006
Posts: 440

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01 Oct 2006, 20:44
uvs_mba wrote:
This one is kinda simple, but I got stuck in the middle with the radicals with the 2ab part

I applied the formula of (a+b)^2

end got to 18 + 2 ab, where a is the first radical and b is the second one. Please explain

2*[sqrt(9+sqrt(80))*(sqrt(9-sqrt(80))] ==>

2*[sqrt((9+sqrt(80)*(9-sqrt(80)))]

so now you can do (a-b)^2
Senior Manager
Joined: 05 Jun 2005
Posts: 449

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01 Oct 2006, 20:54
Thanks Rookie and Nsentra,

i almost forgot about that multiplication radical rule. LOL! I guess thats what happens when you start worrying about the complex crap, and the basic stuff starts getting screwed. Have to go back to the basic formula sheet

Yeah the answer is E
01 Oct 2006, 20:54
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# This one is kinda simple, but I got stuck in the middle with

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