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Is x an integer? (1) x^3 = 8 (2) x = 4^(1/2)

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Is x an integer? (1) x^3 = 8 (2) x = 4^(1/2)  [#permalink]

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New post 26 Apr 2019, 02:16
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

91% (00:25) correct 9% (00:27) wrong based on 289 sessions

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Re: Is x an integer? (1) x^3 = 8 (2) x = 4^(1/2)  [#permalink]

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New post 26 Apr 2019, 02:21
1 stm: get rid of power, x=2. suff
2 stm: x=\(\sqrt{4}\)=2. suff

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Ans: D
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Re: Is x an integer? (1) x^3 = 8 (2) x = 4^(1/2)  [#permalink]

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New post 27 Apr 2019, 06:48
Bunuel wrote:
Is x an integer?

(1) \(x^3 = 8\)
(2) \(x = \sqrt{4}\)

DS22602.01
OG2020 NEW QUESTION


from 1 ; x= 2
and #2
x= +/-2
question has asked x is an integer answer yes
IMO D
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Re: Is x an integer? (1) x^3 = 8 (2) x = 4^(1/2)  [#permalink]

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New post 06 May 2019, 20:05
Archit3110 wrote:
Bunuel wrote:
Is x an integer?

(1) \(x^3 = 8\)
(2) \(x = \sqrt{4}\)

DS22602.01
OG2020 NEW QUESTION




Statement One Alone:

x^3 = 8

Since x^3 = 8, x = 2, then x is an integer.

Statement one alone is sufficient to answer the question.

Statement Two Alone:

x = √4

Since x = √4, x = 2, then x is an integer. (Recall that the square root symbol means to take the principal square root of a number, which is only the positive square root.)

Statement two alone is sufficient to answer the question.

Answer: D
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Re: Is x an integer? (1) x^3 = 8 (2) x = 4^(1/2)  [#permalink]

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New post 11 May 2019, 14:13
Hi All,

We're asked if X is an INTEGER. This is a YES/NO question. This question is built around some standard math rules and Number Properties.

(1) X^3 = 8

With Fact 1, we're cubing the value of X and ending with a POSITIVE value - thus, X MUST be positive. Here, the value of X = +2 and the answer to the question is YES.
Fact 1 is SUFFICIENT

(2) X =√4

With Fact 1, we have a number that's square-rooted for the value of X. The square root of a number has just ONE solution: a POSITIVE one. Here, we're dealing with the positive square-root of 4, so the value of X = +2 and the answer to the question is YES.
Fact 2 is SUFFICIENT

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Re: Is x an integer? (1) x^3 = 8 (2) x = 4^(1/2)  [#permalink]

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New post 13 May 2019, 18:34
X is an Integer?

Statement 1:\(X^3 = 8\)
This gives , X=2. Option A alone is sufficient

Statement 2: X = √4
This gives x=2 , Option B alone is sufficient

Ans: D
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Re: Is x an integer? (1) x^3 = 8 (2) x = 4^(1/2)   [#permalink] 13 May 2019, 18:34
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