If b is positive, is ab positive? 1)a^2b >0 2)a^2 + b=13 : DS Archive
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# If b is positive, is ab positive? 1)a^2b >0 2)a^2 + b=13

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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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27 Feb 2007, 16:37
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If b is positive, is ab positive?

1)a^2b >0
2)a^2 + b=13
Intern
Joined: 08 Jan 2007
Posts: 42
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Kudos [?]: 3 [0], given: 0

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27 Feb 2007, 17:14
E is correct.. can you quickly explain please?
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27 Feb 2007, 17:19
cucrose wrote:
E is correct.. can you quickly explain please?

im not sure if line 1 is a^(2b)> 0 or (a^2)*B > 0

1) a^2 term will be positive regardless of a's sign
2) that inequality holds true for neg and pos values of a
try (-1)^2 + 12=13
(1)^2 + 12=13

both inequalities together do not limit a's sign
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