-
navdeepbajwa
- Senior | Next Rank: 100 Posts
- Posts: 74
- Joined: Sun Aug 02, 2009 9:10 pm
- Thanked: 1 times
- Followed by:1 members
I read that in Official GMAT 12th edition
1)(x^2)^1/2 denotes the non negative square root of x^2, and so (x^2)^1/2=abs x
Can anyone please explain this if x=3 then x^2=9 and root of x has two values -3 and 3 then how can be root of x abs 3 and not +3 and -3
2)Also x^1/2 denotes the positive number whose square is x again the same question why cannot x has both + and - values
1)(x^2)^1/2 denotes the non negative square root of x^2, and so (x^2)^1/2=abs x
Can anyone please explain this if x=3 then x^2=9 and root of x has two values -3 and 3 then how can be root of x abs 3 and not +3 and -3
2)Also x^1/2 denotes the positive number whose square is x again the same question why cannot x has both + and - values
Last edited by navdeepbajwa on Tue Nov 10, 2009 10:28 am, edited 2 times in total.
