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# Is x a negative number? (1) -5*x^99 is positive (2) -5*x^100 is ne

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Math Expert
Joined: 02 Sep 2009
Posts: 52390
Is x a negative number? (1) -5*x^99 is positive (2) -5*x^100 is ne  [#permalink]

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30 Apr 2018, 07:16
00:00

Difficulty:

35% (medium)

Question Stats:

86% (00:46) correct 14% (01:09) wrong based on 21 sessions

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Is x a negative number?

(1) $$-5*x^{99}$$ is positive.

(2) $$-5*x^{100}$$ is negative.

_________________
Senior Manager
Joined: 29 Dec 2017
Posts: 386
Location: United States
Concentration: Marketing, Technology
GMAT 1: 630 Q44 V33
GMAT 2: 690 Q47 V37
GMAT 3: 710 Q50 V37
GPA: 3.25
WE: Marketing (Telecommunications)
Re: Is x a negative number? (1) -5*x^99 is positive (2) -5*x^100 is ne  [#permalink]

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30 Apr 2018, 15:33
Bunuel wrote:
Is x a negative number?

(1) $$-5*x^{99}$$ is positive.
(2) $$-5*x^{100}$$ is negative.

1. $$-5*x^{99}$$ is positive, $$x^{99}$$ <0, x<0 since power 99 is odd - Suff
2. $$-5*x^{100}$$ is negative, x can be any number (except 0) since power 100 is even - NS

Answer (A)
Re: Is x a negative number? (1) -5*x^99 is positive (2) -5*x^100 is ne &nbs [#permalink] 30 Apr 2018, 15:33
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# Is x a negative number? (1) -5*x^99 is positive (2) -5*x^100 is ne

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