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PS: sqrt

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Manager
Joined: 01 Nov 2005
Posts: 126

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10 Nov 2005, 02:41
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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: 363
Location: London

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10 Nov 2005, 04:53
Imaginary roots are not tested on GMAT. So taking the squareroot of
a negative number is not allowed here.
10 Nov 2005, 04:53
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