If b is positive, is ab positive? 1. a^2b>0 2. a^2+b=13 : GMAT Data Sufficiency (DS)
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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]

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17 Jul 2010, 11:19
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If b is positive, is ab positive?

1. a^2b>0
2. a^2+b=13
[Reveal] Spoiler: OA
Manager
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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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Manager
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19 Jul 2010, 02:11
If b is positive, is ab positive?

1. a^2 b>0

2. a^2+b=13

thanks
Manager
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19 Jul 2010, 02:31
can't understand what is written in (1).
a^2*b>0 ?
Manager
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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)
Manager
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19 Jul 2010, 03:00
it is a^2*b>0
And thanks for the effort really appreciate
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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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Senior Manager
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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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