please can somebody clear my doubt

Hi experts,
I would like to know the difference between the 2 equations:
x^2 = 16 and x = sqrt 16
why in the 1st case it has 2 solutions 4 and -4 but in the 2nd case only 1 solution i.e. x = 4.

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Anju@Gurome: GMAT Instructor; Posts: 511; Joined: Wed Aug 11, 2010 9:47 am; Location: Delhi, India; Thanked: 344 times; Followed by:86 members

by Anju@Gurome » Mon Apr 15, 2013 11:56 pm

Refer to the second part of the post I made here >> https://www.beatthegmat.com/mcgraw-hill- ... tml#619715

Anju Agarwal
Quant Expert, Gurome

Backup Methods : General guide on plugging, estimation etc.
Wavy Curve Method : Solving complex inequalities in a matter of seconds.

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