Hey guys, I got my hands on some material from a Kaplan GMAT prep course, and I read in one of the books that the radical sign refers only to the positive root of a numbers. Is that true??? Can anyone comment on that? As far as I know, √25 is ±5, or have I been wrong about that throughout my entire academic and professional career??
EMV
im afraid, Yes!!!
actually, x^2 = 25 means x=±5
BUT, x = sqrt25 => x=5
HTH
http://www.urch.com/forums/showthread.php?t=15859 (Roots of a number: positive or negative?)
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make way for th bull -- Thebullfighter.
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HOLY COW!! What a revelation!! This certainly sheds some light on a whole bunch of data sufficiency questions!! Thanks, bullfighter.
EMV
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