Register to reply 
Constantsby gator
Tags: constants 
Share this thread: 
#1
Jan3006, 07:57 PM

P: 16

Given a, b are constants and lim x approch 1, a root x+3  b all over x1 equals 1. Find a and b
No clue how to answer this, but this is what I think i can do a) get rid of the sqrt b) apply limit See, the problem is I have to unknows so i dont know what to do 


#2
Jan3006, 08:15 PM

P: 788

Is this your problem?
[tex]\lim_{x\rightarrow{1}} \frac{a\sqrt{x+3}b}{x1}=1[/tex]? 


#3
Jan3006, 08:36 PM

HW Helper
P: 2,943

You get a simple linear relationship between a and b. (1) Now you can use L'Hopital's Rule to evaluate a limit of the form 0/0. So differentiate both numerator and denominator. You know that the quotient of these two is also going to be 1 at the limit x>1. So set x = 1 in that. The b term would have vanished, so you can now solve for a. Put that back in equation (1) and work out b, you're done. 


Register to reply 
Related Discussions  
Multiple lines in H2 and Hg emission spectra  Quantum Physics  1  
Variying constants and LQG  Beyond the Standard Model  1  
Physical Constants  General Physics  10  
Ionisation constants  Biology, Chemistry & Other Homework  2  
The 26 Constants  General Physics  4 