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Is xy positive? (1) x = y + 1 (2) (x + y)^2 < (x - y)^2

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Is xy positive? (1) x = y + 1 (2) (x + y)^2 < (x - y)^2  [#permalink]

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New post 18 Feb 2019, 02:29
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Question Stats:

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Is xy positive?

(1) x = y + 1
(2) (x + y)^2 < (x - y)^2
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Joined: 18 Aug 2017
Posts: 4985
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Concentration: Sustainability, Marketing
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Re: Is xy positive? (1) x = y + 1 (2) (x + y)^2 < (x - y)^2  [#permalink]

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New post 18 Feb 2019, 03:04
1
raghavrf wrote:
Is xy positive?
1. x = y + 1
2. (x + y)^2 < (x - y)^2



#1
x=y+1
value of x is dependent on y
so y can be + or -ve or 0
and value of xy can be +,-ve or 0
in sufficient

#2
x + y)^2 < (x - y)^2

value of y has to be -ve to be true and x as +ve
so xy <0 sufficient
IMO B
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Re: Is xy positive? (1) x = y + 1 (2) (x + y)^2 < (x - y)^2  [#permalink]

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New post 11 Oct 2019, 00:36
1 x = y +1
values can be positive, negative or zero. in sufficient

2
since x-y portion is bigger, the signs are different hence this is sufficient
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Re: Is xy positive? (1) x = y + 1 (2) (x + y)^2 < (x - y)^2   [#permalink] 11 Oct 2019, 00:36
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