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If \(\sqrt{xy} = 3\), what is the value of x ?
(1) x = y
(2) y = 3
(1) x = y
(2) y = 3
17 Sep 2017, 03:11
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Bunuel
If \(\sqrt{xy} = 3\), what is the value of x ?
(1) x = y
(2) y = 3
(1) x = y
(2) y = 3
1. x = y gives us \sqrt{x^2} = 3 -----> |x| = 3 ----------> x = +3 or -3. Hence insufficient.
2. y =3 gives us \sqrt{x3} = 3 ---- on squaring both sides we get 3x = 9 --------> hence x=3. Sufficient
Answer is (B)
17 Sep 2017, 03:20
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I think the answer is B
1, X=Y-> /x/=3 -> x = 3 or x = -3 -> insufficient
2, y = 3 -> 3x = 9 -> x=3 -> sufficient
1, X=Y-> /x/=3 -> x = 3 or x = -3 -> insufficient
2, y = 3 -> 3x = 9 -> x=3 -> sufficient
