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kevincan
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GRE 1: Q170 V170
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GRE 1: Q170 V170
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Made a lot of careless mistakes sorry gona rework the computation
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haas_mba07
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Answer: A

Given (x-4)^2 > 9- (x-3)^2
x^2-8x+16 > 9 - x^2 +6x -9

x^2-8x+16 > 6x - x^2
2x^2 -14x + 16 > 0
x^2 -7x +8 > 0

Q: Is (x^2-7x+8) > 0?

S1: (x-2) = 9k + 8 where k is some integer.

or x = 9k + 10

As k = 0, 1, 2, 3...
x = 10, 19, 28, 27, 46 ...

Subsituting x =10 in eqn:
100 - 70 + 8 = 108-70 = 38 >0.
For all subsequent values of x, x^2-7x+8 > 0.
Sufficient.

S2: |x-8| > |x-3|

For this eqn:
(x-8) > 0 & (x-3) > 0 is not consistent
(x-8) < 0 & (x-3) < 0 is not consistent
(x-8) > 0 & (x-3) < 0 is not consistent

For (x-8) < 0 & (x-3) > 0,
=> x < 8 & x > 3,
Solving, x < 5/2 and x < 8 and x < 3 Inconsistent.

Not sufficient.

Answer: A
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haas_mba07

S2: |x-8| > |x-3|

For this eqn:
(x-8) > 0 & (x-3) > 0 is not consistent
(x-8) 0 & (x-3) 0,
=> x 3,
Solving, x 3 ? [/color]

Not sufficient.

Answer: A


I agree with the 3 inconsistent eqns formed from the absolute inequality in st 2.
However, on solving the one which does make sense i.e. (x-8) 0, I get x < 11/2 .
thus, x lies between 3 and 11/2.
take the value of x to be 4 or 5.
for both these values, the question stem returns a negative response.
Thus, we are able to answer the question based on st 2 as well.

IMO answer should be D.
Can someone pls give OE ?



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