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Manager

Joined: 01 Nov 2005

Posts: 128

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Kudos [?]: 1 [0], given: 0

PS: sqrt [#permalink]

10 Nov 2005, 02:41

00:00

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: 367

Location: London

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Kudos [?]: 2 [0], given: 0

[#permalink]

10 Nov 2005, 04:53

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

[#permalink] 10 Nov 2005, 04:53

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PS: sqrt

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