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inequality

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Intern
Joined: 17 Aug 2003
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02 Jan 2004, 17:45
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Which of the following number ranges always solves this inequality:
z┬▓ - 4z > 5

A) z > -5

B) z < 5

C) z > -1

D) z < 1

E) z < -1
Intern
Joined: 24 Nov 2003
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Location: Champaign
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02 Jan 2004, 18:34
E

z┬▓ - 4z > 5

A) z > -5

B) z < 5

C) z > -1

D) z < 1

E) z < -1

Look at the second term it is -ve so anything -ve multiplied to it will produce +ve number no matter how small the z^2 term is, for E the largest value is -2, -3, -3 sp lets test -2, 4 + 8 = 12 > 5
Director
Joined: 14 Oct 2003
Posts: 587
Location: On Vacation at My Crawford, Texas Ranch
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02 Jan 2004, 18:40
oops my bad - i just did the quadratic without thinking twice about it- you're right!
[#permalink] 02 Jan 2004, 18:40
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inequality

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