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

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Intern
Joined: 01 Jan 2007
Posts: 23
If z - 4z > 5 then which of the following is always true [#permalink]

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15 Aug 2008, 08:40
If z² - 4z > 5 then which of the following is always true

A) z > -5
B) z -1
D) z < 1
E) z < -1

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Director
Joined: 27 May 2008
Posts: 539

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15 Aug 2008, 08:49
tekno9000 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

Q : z^2 - 4z - 5 > 0
z^2 - 5z + z - 5 > 0
z(z-5) + 1(z-5) > 0
(z-5)(z+1) > 0

either both are +ve
z > 5
OR
both are -ve
z < -1

Option E
VP
Joined: 28 Dec 2005
Posts: 1498

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15 Aug 2008, 09:08
E, same explanation as above
Manager
Joined: 30 Jul 2007
Posts: 130

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15 Aug 2008, 10:54
tekno9000 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

Is that Z^Z, or Z^2?
Intern
Joined: 13 Aug 2008
Posts: 17

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18 Aug 2008, 01:19
why not C? z>-1?

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: Another inequality   [#permalink] 18 Aug 2008, 01:19
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# If z - 4z > 5 then which of the following is always true

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