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# PS: sqrt

Author Message
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Manager
Joined: 01 Nov 2005
Posts: 126
Followers: 1

Kudos [?]: 25 [0], given: 0

PS: sqrt [#permalink]  10 Nov 2005, 01:41
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
If x > 0.9, which of the following could be the value of x?

a) sqrt 0.81
b) sqrt 0.9
c) (0.9)^2
d) (0.9)(0.99)
e) 1- (sqrt 0.01)

the OA is B, which makes sense. but the answer can be E too if sqrt 0.01 = -0.1

can someone explain why this question assumes sqrt to be positive?
Senior Manager
Joined: 22 Jun 2005
Posts: 364
Location: London
Followers: 1

Kudos [?]: 5 [0], given: 0

Imaginary roots are not tested on GMAT. So taking the squareroot of
a negative number is not allowed here.
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