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

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This one is kinda simple, but I got stuck in the middle with [#permalink] New post 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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 [#permalink] New post 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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Re: GMATPREP-PS-Radicals [#permalink] New post 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
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 [#permalink] New post 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 :wink:

Yeah the answer is E
  [#permalink] 01 Oct 2006, 20:54
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