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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
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This one is kinda simple, but I got stuck in the middle with [#permalink]  01 Oct 2006, 19:29
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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
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Hi uvs...

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

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Senior Manager
Joined: 31 Jul 2006
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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: 455
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Kudos [?]: 23 [0], given: 0

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

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