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(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.

gmatclubot

Re: What is the value of x^5?
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23 Nov 2017, 13:00