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23 Nov 2017, 05:51
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23 Nov 2017, 05:56
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Bunuel
What is the value of x^5?
(1) x^2 = 9
(2) x^3 > 9
(1) x^2 = 9
(2) x^3 > 9
S1) x = -3,3
Insufficient.
S2) \(x^3\) > 9
x = 3,4,5,....
Insufficient.
Quote:
combining both statements
x = -3,3\(x^3\) > 9 => x > 0
=> x = 3
We can find the value of \(x^5\)
Sufficient.
C is the answer.
23 Nov 2017, 13:00
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Bunuel
What is the value of x^5?
(1) x^2 = 9
(2) x^3 > 9
(1) x^2 = 9
(2) x^3 > 9
(1) x^2 = 9 : x = + or - \sqrt{9} we need to find out if the root is positive or negative, insuf.
(2) x^3 > 9 : since x^3 is > 9, then x must be a positive. But we don't know the value of x, insuf.
(C) from (2) we know that 'x' is a positive and from (1) we know the value of 'x', so sufficient.
