What positive number, when squared, is equal to the cube of : PS Archive
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# What positive number, when squared, is equal to the cube of

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Intern
Joined: 02 Sep 2004
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What positive number, when squared, is equal to the cube of [#permalink]

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12 Oct 2004, 12:23
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What positive number, when squared, is equal to the cube of the positive square root of 16?

64

56

32

8

2
Manager
Joined: 07 Sep 2004
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12 Oct 2004, 16:48
D

just to point something in problem. It is meaningless to say positive square root. As if the value of square root can be negative.

we know that the value of square root is always positive. So why the redundancy.
Intern
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13 Oct 2004, 02:58
ans is D for me also..
i agree with last posting saying about that It is meaningless to say positive square root..

anyway...
x^2 = (16^1/2)^3

=> x^2 = 64

=> x =8

hence D
Manager
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14 Oct 2004, 12:40
agree with the above. D would be the answer.
CEO
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14 Oct 2004, 22:39
Please see GMAT OG 9th ed. p. 41:

"Every positive number n has two square roots, one positive and the other negative . . ."

Hjort
14 Oct 2004, 22:39
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