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## PP Test Prob

This topic has 5 member replies
anupam Junior | Next Rank: 30 Posts
Joined
03 Aug 2006
Posted:
12 messages

#### PP Test Prob

Thu Sep 07, 2006 7:21 am
if x<0 , then Sq.Root(-x*|x|) is

x or -x ??

Do we always take the square root of 4 as 2 on GMAT or -2 is also a correct choice !!!
This was in one of my PP tests

r4rohini Newbie | Next Rank: 10 Posts
Joined
02 Aug 2006
Posted:
3 messages
Thu Sep 21, 2006 1:37 am
Plzz ignore my previous reply.. dont know how to delete that...

See Square root of a no can be +ve or -ve
And Sqaure root of a -ve no is not possible, its undefined

So for this question
if x<0 , then Sq.Root(-x*|x|) is

assume x=-4

Sq.Root(-(-4)*|-4|) = Sq.Root (4*4) = Sq.Root (16 ) = +4 or -4

So the answer to this question is x and -x

r4rohini Newbie | Next Rank: 10 Posts
Joined
02 Aug 2006
Posted:
3 messages
Thu Sep 21, 2006 1:27 am

Last edited by r4rohini on Thu Sep 21, 2006 1:38 am; edited 1 time in total

aim-wsc Legendary Member
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Mon Sep 11, 2006 1:47 am
both -ve as well as +ve value.

you always take both values in GMAT

whats the problem btw?

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anupam Junior | Next Rank: 30 Posts
Joined
03 Aug 2006
Posted:
12 messages
Wed Sep 13, 2006 12:05 am
this was the prob.
and it had both the options x as well as -x
however, i came across in the OG that root of a no will always be positive...

so sq root(9) will be 3

and therefore i think, sq root of (-3*-3) will also be 3

aim-wsc Legendary Member
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Wed Sep 13, 2006 6:54 am
all right.

but be careful in DS questions they consider both cases in DS.

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