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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
Joined: 22 Mar 2010
Posts: 60
If b is positive, is ab positive? 1. a^2b>0 2. a^2+b=13 [#permalink]

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17 Jul 2010, 12:19
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15% (low)

Question Stats:

97% (01:41) correct 3% (01:18) wrong based on 36 sessions

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If b is positive, is ab positive?

1. a^2b>0
2. a^2+b=13
[Reveal] Spoiler: OA
Manager
Joined: 24 Jan 2010
Posts: 156
Location: India
Schools: ISB

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17 Jul 2010, 12:40
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
Joined: 09 Jun 2010
Posts: 78

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19 Jul 2010, 03:11
If b is positive, is ab positive?

1. a^2 b>0

2. a^2+b=13

thanks
Manager
Joined: 03 Jun 2010
Posts: 181
Location: United States (MI)
Concentration: Marketing, General Management

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19 Jul 2010, 03:31
can't understand what is written in (1).
a^2*b>0 ?
Manager
Joined: 03 Jun 2010
Posts: 181
Location: United States (MI)
Concentration: Marketing, General Management

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19 Jul 2010, 03:35
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
Joined: 09 Jun 2010
Posts: 78

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19 Jul 2010, 04:00
it is a^2*b>0
And thanks for the effort really appreciate
Senior Manager
Joined: 25 Feb 2010
Posts: 461

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19 Jul 2010, 06:11
(1) we can't estimate the sign of a
(2) Insufficient

No info after combining... E
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Senior Manager
Joined: 25 Feb 2010
Posts: 461

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19 Jul 2010, 06:22
A

ds-numbers-97408.html
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Its your duty to post OA afterwards; some one must be waiting for that...

Re: Help required pleas   [#permalink] 19 Jul 2010, 06:22
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