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If z - 4z > 5 then which of the following is always true

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VP
VP
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If z - 4z > 5 then which of the following is always true [#permalink] New post 14 Jul 2006, 14:15
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A
B
C
D
E

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If z² - 4z > 5 then which of the following is always true

A) z > -5

B) z < 5

C) z > -1

D) z < 1

E) z < -1
Senior Manager
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Re: PS: Inequality [#permalink] New post 14 Jul 2006, 18:17
u2lover wrote:
If z² - 4z > 5 then which of the following is always true

A) z > -5

B) z < 5

C) z > -1

D) z < 1

E) z < -1


(E) it is.
Its easy to see that inequality is false for z = 0, only (E) satisfies non-zero values of z..
CEO
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Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008
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 [#permalink] New post 22 Jul 2006, 12:19
E.

Z > 5 can also be the answer but its not in the choices.

C could have been the answer but when z = 0 then the equality doesn't hold true.
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SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

  [#permalink] 22 Jul 2006, 12:19
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If z - 4z > 5 then which of the following is always true

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