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Is x greater than zero?

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Math Expert
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V
Joined: 02 Sep 2009
Posts: 50044
Is x greater than zero?  [#permalink]

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New post 29 Oct 2017, 01:44
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

83% (00:58) correct 17% (00:57) wrong based on 30 sessions

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Manager
Manager
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B
Joined: 21 Jun 2014
Posts: 62
Re: Is x greater than zero?  [#permalink]

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New post 29 Oct 2017, 10:49
B
St1: X can be 2 or -2
St 2. : X can be only 2

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Senior Manager
Senior Manager
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P
Joined: 07 Jul 2012
Posts: 376
Location: India
Concentration: Finance, Accounting
GPA: 3.5
Premium Member CAT Tests
Re: Is x greater than zero?  [#permalink]

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New post 29 Oct 2017, 19:17
(1) \(x^4\)-16=0
\(x^4\)= 16
x could be 2 or -2 [Insuff]

(2)\(x^3\)-8=0
\(x^3\)= 8
x must be +2 [Suff]

Answer: B.

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Re: Is x greater than zero? &nbs [#permalink] 29 Oct 2017, 19:17
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