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# ordering question

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Intern
Joined: 20 Jun 2008
Posts: 22

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ordering question [#permalink]

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22 Jun 2008, 05:19
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If x is positive ,which of the following could be correct ordering of 1/x,2x,and x^2?

Answer says:
x^2 < 1/x < 2x.

Could somebody give me an example for this?
Thx in advance.

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Senior Manager
Joined: 12 Apr 2008
Posts: 499

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Location: Eastern Europe
Schools: Oxford
Re: ordering question [#permalink]

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22 Jun 2008, 12:47
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Hi!
You may pick x that is slightly less than 1:
0.9, for example.

0.81< 1.11 < 1.8

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Intern
Joined: 20 Jun 2008
Posts: 22

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Re: ordering question [#permalink]

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23 Jun 2008, 02:09
Thx (+1) greenoak.
I just thought all the number between 0 and 1 will behave similarly so i just took 0.5 and i was mistaken.

greenoak wrote:
Hi!
You may pick x that is slightly less than 1:
0.9, for example.

0.81< 1.11 < 1.8

Kudos [?]: [0], given: 0

Senior Manager
Joined: 12 Apr 2008
Posts: 499

Kudos [?]: 247 [0], given: 4

Location: Eastern Europe
Schools: Oxford
Re: ordering question [#permalink]

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23 Jun 2008, 04:16
No problem!
I think it might be useful to draw a picture when in doubt, in order to see where the graphs intercept. For this problem, any x such that 1/√2 < x < 1 could be an example.
See the attached picture (sorry for pic. quality – was done in Word).
Attachments

graphs.doc [19.5 KiB]
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Kudos [?]: 247 [0], given: 4

Intern
Joined: 20 Jun 2008
Posts: 22

Kudos [?]: [0], given: 0

Re: ordering question [#permalink]

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23 Jun 2008, 04:45
greenoak,
it is very intelligent of you to attack such a problem by drawing the lines.
you have broaden my vision.
one more thx.

greenoak wrote:
No problem!
I think it might be useful to draw a picture when in doubt, in order to see where the graphs intercept. For this problem, any x such that 1/√2 < x < 1 could be an example.
See the attached picture (sorry for pic. quality – was done in Word).

Kudos [?]: [0], given: 0

Re: ordering question   [#permalink] 23 Jun 2008, 04:45
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# ordering question

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