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Is ab > 0? (1) b*a^4 > 0 (2) b + a^3 > 0

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Is ab > 0? (1) b*a^4 > 0 (2) b + a^3 > 0  [#permalink]

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New post Updated on: 08 Mar 2019, 00:35
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Difficulty:

  35% (medium)

Question Stats:

68% (01:04) correct 32% (01:50) wrong based on 25 sessions

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Is \(ab>0?\)


(1) \(b*a^4>0\)

(2) \(b+a^3>0\)

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Originally posted by AsadAbu on 07 Mar 2019, 11:52.
Last edited by Bunuel on 08 Mar 2019, 00:35, edited 1 time in total.
Renamed the topic and edited the question.
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Re: Is ab > 0? (1) b*a^4 > 0 (2) b + a^3 > 0  [#permalink]

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New post 07 Mar 2019, 19:21
1
Is \(ab>0?\)
so we have to find if both a and B are non zero and of same sign
1) \(b × a^4>0\)...b is surely positive, but we cannot say anything about sign of a... insufficient
2) \(b+a^3>0\)..We can just say that at least one of b or a is positive. Nothing more. Insufficient

Combined..
Again nothing much about a..
Insufficient

E
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1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html
4) Base while finding % increase and % decrease : https://gmatclub.com/forum/percentage-increase-decrease-what-should-be-the-denominator-287528.html


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Re: Is ab > 0? (1) b*a^4 > 0 (2) b + a^3 > 0  [#permalink]

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New post 11 Mar 2019, 09:15
AsadAbu wrote:
Is \(ab>0?\)


(1) \(b*a^4>0\)

(2) \(b+a^3>0\)


ab>0

#1
\(b*a^4>0\)
a can be + or -ve
insufficient
#2
\(b+a^3>0\)
a can be +ve or -ve
in sufficinet
from 1 &2
we cannto determine value whether ab>0
IMO E
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Re: Is ab > 0? (1) b*a^4 > 0 (2) b + a^3 > 0   [#permalink] 11 Mar 2019, 09:15
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