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# Operations on radical expressions help

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Intern
Joined: 20 Aug 2018
Posts: 1

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20 Aug 2018, 22:17
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The number [square_root 63− [36][/3]] can be expressed as
x + [y][/3] for some integers x and y. What is the value
of xy ?
(A) –18
(B) –6
(C) 6
(D) 18
(E) 27
Math Expert
Joined: 02 Sep 2009
Posts: 55732

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20 Aug 2018, 22:59
Sushimon wrote:
The number [square_root 63− [36][/3]] can be expressed as
x + [y][/3] for some integers x and y. What is the value
of xy ?
(A) –18
(B) –6
(C) 6
(D) 18
(E) 27

This question is discussed here: https://gmatclub.com/forum/the-number-c ... 45521.html Hope it helps.

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