SQ. Roots
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I think i saw this solved in an earlier post but I can't seem to find it...
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- Gmat Prep 2 (2nd) - SQ Roots.doc
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Sqrt(9+srq80) + sqt(9-sqrt80)}^2
This is (a+b)^2 = a^2 +b^2+2ab
[sqrt(9+sqrt80)]^2 +[sqrt(9-sqt 80)]^2 - 2*{sqrt(9+sqt80)*sqt(9-sqt80)
=> 9+sqt80 +9- sqt80 - 2
=20
I hope its clear ,its hard to explain without using proper symbols.
This is (a+b)^2 = a^2 +b^2+2ab
[sqrt(9+sqrt80)]^2 +[sqrt(9-sqt 80)]^2 - 2*{sqrt(9+sqt80)*sqt(9-sqt80)
=> 9+sqt80 +9- sqt80 - 2
=20
I hope its clear ,its hard to explain without using proper symbols.