If x^3 < 16x, which of the following includes at least some of the possible solutions for x, but no
values that are not solutions?
(A) |x| < 4
(B) x < 4
(C) x > 4
(D) x < -4
(E) x > 0
OA D
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tapanmittal
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[email protected]
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Hi tapanmittal,
This question can be solved by TESTing VALUES and eliminating answer choices. Notice how the answers all seem to 'revolve around the numbers 4 and -4.....
We're told that X^3 < 16X. We're told to find an answer that does NOT include any non-solutions for X...If you TEST VALUES, you should be able to eliminate some of the Answers...
X=0
0 is NOT < 0, so 0 is NOT a solution
Eliminate Answers A and B.
X=5
125 is NOT < 80, so 5 is NOT a solution
Eliminate Answers C and E
There's only one answer remaining...
Final Answer: D
GMAT assassins aren't born, they're made,
Rich
This question can be solved by TESTing VALUES and eliminating answer choices. Notice how the answers all seem to 'revolve around the numbers 4 and -4.....
We're told that X^3 < 16X. We're told to find an answer that does NOT include any non-solutions for X...If you TEST VALUES, you should be able to eliminate some of the Answers...
X=0
0 is NOT < 0, so 0 is NOT a solution
Eliminate Answers A and B.
X=5
125 is NOT < 80, so 5 is NOT a solution
Eliminate Answers C and E
There's only one answer remaining...
Final Answer: D
GMAT assassins aren't born, they're made,
Rich
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bubbliiiiiiii
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- GMAT Score:700
