General Question re: difference w/ sq. root in denom..

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DCS80: Senior | Next Rank: 100 Posts; Posts: 33; Joined: Mon Dec 03, 2012 6:08 pmFollowed by: 2 members; Thanked: 2 times

by DCS80 » Tue Jan 29, 2013 12:45 pm

Why do we use the conjugate here? Don't understand the application.

Could someone briefly explain?

Thx

DS

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Source: Beat The GMAT — Problem Solving | Tue Jan 29, 2013 12:45 pm

GMATGuruNY: GMAT Instructor; Posts: 15539; Joined: Tue May 25, 2010 12:04 pmFollowed by: 1906 members; Location: New York, NY; Thanked: 13060 times; GMAT Score:790

by GMATGuruNY » Tue Jan 29, 2013 11:35 pm

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