GMAT Prep - Radicals Square Root - weird - The Beat The GMAT Forum

givemeanid: Master | Next Rank: 500 Posts; Posts: 277; Joined: Sun Jun 17, 2007 2:51 pm; Location: New York, NY; Thanked: 6 times; Followed by:1 members

by givemeanid » Mon Sep 03, 2007 6:38 pm

Square root of a negative number is not a real number. It is an imaginary number but GMAT does not deal with those.

So, sqrt(2-sqrtx) will not be defined when sqrt(x) > 2 which would make the number inside the radical negative. sqrt(5) > 2 and hence, the result.

So It Goes

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