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02 Oct 2017, 00:47
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
57% (01:14) correct
43%
(01:25)
wrong
based on 260
sessions
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02 Oct 2017, 01:14
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1/ X^2 + Y^2 = 2XY => X^2-2XY +Y^2 = 0 => (X-Y)^2 = 0 => X=Y => X^2 - Y^2 = 0 => Suff
2/ X=|Y| => X^2 = Y^2 =>X^2 - Y^2 = 0 => Suff
=> Answer D
2/ X=|Y| => X^2 = Y^2 =>X^2 - Y^2 = 0 => Suff
=> Answer D
Mo2men
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10 Apr 2018, 20:26
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Bunuel
(1) x^2 + y^2 = 2xy
Rearrange the equation: x^2 -2xy + y^2 = 0
(x - y)^2 =0.......x - y =0..then x = y
x^2 – y^2 = x^2 – x^2 = 0
Sufficient
(2) x = |y|
No matter the sign of x or y, it will be always positive as it is raised to power 2
x^2 – y^2 = |y|^2 – y^2 = 0
Sufficient
Answer: D
