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#1 2007-12-23 05:46:13

tony123
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solve inequality

 

#2 2007-12-23 06:35:23

mathsyperson
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Re: solve inequality


Why did the vector cross the road?
It wanted to be normal.
 

#3 2007-12-23 21:48:56

tony123
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Re: solve inequality

Tank you mathsyperson but
let x=6/10

 

#4 2007-12-23 22:57:24

mathsyperson
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Re: solve inequality

Sorry, I'm not sure what you're getting at.
6/10 is a solution and is in my solution set, so there's no contradiction.

If you're hinting at a more elegant method of reaching the answer, I'm afraid I don't get that either.


Why did the vector cross the road?
It wanted to be normal.
 

#5 2007-12-23 23:56:10

JaneFairfax
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Re: solve inequality

Perhaps hes hinting that your solution isnt wholly correct. x = 6⁄10 is NOT a solution. Also, you cant have x = 1. What is logarithm to base 1, anyway?

Anyway, logx where x < 1 problematic. If x < 1, then you actually have logxy > 0 when y < 1 and logxy < 0 when y > 1. With this in mind, I think youll find that not only



is invalid but also



is a solution set as well.

Last edited by JaneFairfax (2007-12-24 00:00:39)


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#6 2007-12-24 00:42:59

mathsyperson
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Re: solve inequality

Ah, fair enough. I made too many assumptions in the first step.


Why did the vector cross the road?
It wanted to be normal.
 

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