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Which of the following inequalities has a solution set that

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Which of the following inequalities has a solution set that [#permalink] New post 14 Apr 2012, 05:43
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Which of the following inequalities has a solution set that, when graphed on a number line, is a single, finite line segment?

A. x>=4
B. x^2>=4
C. x^3>=64
D. |x|>=4
E. |x|<=4
[Reveal] Spoiler: OA

Last edited by Bunuel on 14 Apr 2012, 10:00, edited 3 times in total.
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Re: Which of the following inequalities has a solution set...... [#permalink] New post 14 Apr 2012, 06:46
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rpamecha wrote:
Which of the following inequalities has a solution set that, when graphed on a number line, is a single, finite line segment?

1) x>=4
2) x^2>=4
3) x^3>=64
4) |x|>=4
5) |x|<=4

Please explain your answer.

OA to follow, after some discussion.


its 5).
-4 <= x<= 4

rest of the solution sets are not finite

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Re: Which of the following inequalities has a solution set that [#permalink] New post 14 Apr 2012, 10:16
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Which of the following inequalities has a solution set that, when graphed on a number line, is a single, finite line segment?

A. x>=4 --> this inequality clearly has one infinite solution set:
Attachment:
A..gif
A..gif [ 978 Bytes | Viewed 5756 times ]

B. x^2>=4 --> this inequality has two infinite solution sets, x\leq{-2} and x\geq{2}:
Attachment:
B..gif
B..gif [ 1.02 KiB | Viewed 5752 times ]

C. x^3>=64 --> this inequality has one infinite solution set, x\geq{4}:
Attachment:
C..gif
C..gif [ 978 Bytes | Viewed 5754 times ]

D. |x|>=4 --> this inequality has two infinite solution sets, x\leq{-4} and x\geq{4}:
Attachment:
D..gif
D..gif [ 992 Bytes | Viewed 5750 times ]

E. |x|<=4 --> this inequality has one finite solution set, -4\leq{x}\leq{4}:
Attachment:
E..gif
E..gif [ 681 Bytes | Viewed 5756 times ]


Answer: E.

Similar question to practice: which-of-the-following-inequalities-has-a-solution-set-that-127820.html

Hope it helps.

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Re: Which of the following inequalities has a solution set that [#permalink] New post 27 Jun 2012, 10:36
rpamecha wrote:
Which of the following inequalities has a solution set that, when graphed on a number line, is a single, finite line segment?

A. x>=4
B. x^2>=4
C. x^3>=64
D. |x|>=4
E. |x|<=4


The best way to solve this problem is to do so using number lines.
a) Infinite
b) |x|>=2 which means x>=2 and x<=-2. Infinitite in opposite directions.
c) x>=4 Infinite
d) x>=4 and x<=-1 Infinite in opposite directions
e) x<=4 and x>=-4 which means -4<=x<=4. !!!

The answer is E.
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Re: Which of the following inequalities has a solution set that [#permalink] New post 17 Jun 2013, 04:51
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Re: Which of the following inequalities has a solution set that [#permalink] New post 01 Jul 2013, 06:59
Which of the following inequalities has a solution set that, when graphed on a number line, is a single, finite line segment?

A. x>=4
B. x^2>=4
C. x^3>=64
D. |x|>=4
E. |x|<=4

Running through the list, it's pretty easy to rule out A, B, C

Let's try D
|x|>=4

x≥4
OR
-x≥4 ===> x≤-4
In other words, x may be greater than four (going from left to infinity on the number line) or it could be less than negative four (going from right to negative infinity on the number line)
INCORRECT

|x|<=4
x≤4
-x≤4 ===> x≥-4

So:
-4≤x≤4
In other words, x could be between -4 and 4 on the number line.

(E)
Re: Which of the following inequalities has a solution set that   [#permalink] 01 Jul 2013, 06:59
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