Author 
Topic 

markmil2002
Average Member
USA
11 Posts 
Posted  09/06/2007 : 12:05:15

I cant figure out where to start on this problem.
((2e^x)(xe^x))/(1x^2) > 0 


pka
Advanced Member
USA
2731 Posts 
Posted  09/06/2007 : 13:49:10

Because e^{x} is always positive, it contributes nothing to the problem.
Therefore, just solve (2x)/[(1x)(1+x)]>0. Here the critical numbers are 2, 1, & 1. Use those to find the intervals where the statement is true.



markmil2002
Average Member
USA
11 Posts 
Posted  09/06/2007 : 14:25:13

Thanks. I assumed that e could be removed from the equation, but my problem was that I forgot about setting a problem up with the intervals. I took a little brake from math and I'm a little Rusty now, lol. 


sahsjing
Advanced Member
USA
2399 Posts 
Posted  09/06/2007 : 18:20:41

quote: Originally posted by markmil2002
I cant figure out where to start on this problem.
((2e^x)(xe^x))/(1x^2) > 0
Do you know it has the same solution as (2x)(1x)(1+x) > 0? 



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