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# Is x positive? (1) x^2 + 10 x > 0 (2) 3^x > 1

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Math Expert
Joined: 02 Sep 2009
Posts: 50627
Is x positive? (1) x^2 + 10 x > 0 (2) 3^x > 1  [#permalink]

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29 Oct 2017, 00:41
00:00

Difficulty:

35% (medium)

Question Stats:

68% (01:12) correct 32% (01:01) wrong based on 60 sessions

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Is x positive?

(1) x^2 + 10 x > 0
(2) 3^x > 1

_________________
PS Forum Moderator
Joined: 25 Feb 2013
Posts: 1217
Location: India
GPA: 3.82
Is x positive? (1) x^2 + 10 x > 0 (2) 3^x > 1  [#permalink]

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29 Oct 2017, 10:37
1
Bunuel wrote:
Is x positive?

(1) x^2 + 10 x > 0
(2) 3^x > 1

Statement 1: implies $$x(x+10)>0$$

$$=> x<-10$$ or $$x>0$$. clearly $$x$$ can be negative or positive. Hence insufficient

Statement 2: $$3^x>3^0 => x>0$$. Sufficient

Option B
Is x positive? (1) x^2 + 10 x > 0 (2) 3^x > 1 &nbs [#permalink] 29 Oct 2017, 10:37
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# Is x positive? (1) x^2 + 10 x > 0 (2) 3^x > 1

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