You have made a typographical error and I am not sure what the OA is
but my answer is D
Stem : We need xy(x+y)
xy = -6 , also implies x & y are non-zero
We need to find x + y
Since we know xy=-6, finding either x or y will suffice
(I) x-y = 5
Multiplying both sides by y (since y is non-zero)
xy - y^2 = 5y
But xy = -6
-6 - y^2 = 5y
Its a quad equation which can be solved. Hence Suff.
(II) x*y^2 = 18
Since xy=-6
-6*y = 18
Hence y = -3
Hence Suff
IMO D
Can anyone please help me out with this DS question?
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Source: Beat The GMAT — Data Sufficiency |
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eaakbari
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Yes, sorry the answer is B.
That's becuase in Case I.
The quadratic equation -6 - y^2 = 5y OR
y^2 +5y + 6
simplifies to
(y+2)(y-3)
Since y can assume both values -2 or -3
It is not sufficient.
Hence B
DS can make a fool of you...XD
That's becuase in Case I.
The quadratic equation -6 - y^2 = 5y OR
y^2 +5y + 6
simplifies to
(y+2)(y-3)
Since y can assume both values -2 or -3
It is not sufficient.
Hence B
DS can make a fool of you...XD
Whether you think you can or can't, you're right.
- Henry Ford
- Henry Ford
