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Is x greater than zero?

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Source: — Data Sufficiency |

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by Jay@ManhattanReview » Sun Oct 29, 2017 9:53 pm
ardz24 wrote:Is x greater than zero?

(1) x^4 - 16 = 0
(2) x^3 - 8 = 0

What's the best way to determine which statement is sufficient?
(1) x^4 - 16 = 0

=> x = ±4.

If x = 4 > 0, the answer is Yes, however, if x = -4 < 0, the answer is no.

(2) x^3 - 8 = 0

=> x = 2 > 0. The answer is Yes. Sufficient.

The correct answer: B

Hope this helps!

-Jay

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