|Jan30-06, 07:57 PM||#1|
Given a, b are constants and lim x approch 1, a root x+3 - b all over x-1 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
|Jan30-06, 08:15 PM||#2|
Is this your problem?
|Jan30-06, 08:36 PM||#3|
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.
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