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If b is positive, is ab positive? 1. a^2b>0 2. a^2+b=13

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Manager
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If b is positive, is ab positive? 1. a^2b>0 2. a^2+b=13 [#permalink] New post 17 Jul 2010, 11:19
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A
B
C
D
E

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  35% (medium)

Question Stats:

100% (01:53) correct 0% (00:00) wrong based on 10 sessions
If b is positive, is ab positive?

1. a^2b>0
2. a^2+b=13
[Reveal] Spoiler: OA
Manager
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Location: India
Schools: ISB
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Re: DS : Numbers [#permalink] New post 17 Jul 2010, 11:40
Ans is E, it is not possible to determine the sign of a using either 1st or 2nd or both the equations
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Help required pleas [#permalink] New post 19 Jul 2010, 02:11
If b is positive, is ab positive?

1. a^2 b>0

2. a^2+b=13

thanks
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Location: United States (MI)
Concentration: Marketing, General Management
WE: Business Development (Consumer Products)
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Re: Help required pleas [#permalink] New post 19 Jul 2010, 02:31
can't understand what is written in (1).
a^2*b>0 ?
Manager
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Re: DS : Numbers [#permalink] New post 19 Jul 2010, 02:35
if b positive, then a must be positive to get ab>0

(1) we can't estimate the sign of a, because a^2 is always positive, b positive too.
(2) the same thing
when combining no new info.
(E)
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Re: Help required pleas [#permalink] New post 19 Jul 2010, 03:00
it is a^2*b>0
And thanks for the effort really appreciate
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Re: DS : Numbers [#permalink] New post 19 Jul 2010, 05:11
(1) we can't estimate the sign of a
(2) Insufficient

No info after combining... E
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Re: Help required pleas [#permalink] New post 19 Jul 2010, 05:22
A

ds-numbers-97408.html
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Re: Help required pleas   [#permalink] 19 Jul 2010, 05:22
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If b is positive, is ab positive? 1. a^2b>0 2. a^2+b=13

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