Bunuel wrote:
SOLUTION
Is x^2 greater than x?
Is\( x^2 >x\) ? --> is\(x(x-1)>0\) ? --> is\(x\) in the following ranges:\(x<0\) or\(x>1\) ?
(1) x^2 is greater than 1 -->\(x^2>1\) -->\(x<-1\) or\(x>1\) . Sufficient.
(2) x is greater than -1 -->\(x>-1\) . Not sufficient.
Answer:A.
9.Inequalities
- Theory
Inequalities MadeEasy!
Inequalities: Tips andhints
Arithmetic withInequalities
Wavy Line Method Application - Complex AlgebraicInequalities
Solving Quadratic Inequalities: GraphicApproach
Inequalities - QuadraticInequalities
Graphic approach to problems withinequalities
Inequalitiestrick
INEQUATIONS(Inequalities) Part1
INEQUATIONS(Inequalities) Part2
For more check Ultimate GMAT QuantitativeMegathread
Hope ithelps.
Bunuel
I realize that Brent discusses testing values above. But, what approach did you take to get from x(x-1)>0 to then x<0 or x>1?
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Statistics : Posted by woohoo921 • on 09 Feb 2014, 23:24 • Replies 8 • Views 30847