I can find b by using L'Hopital's Rule, where b is , but I don't know how to find a

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- May 2nd 2010, 12:45 AMacevipaLimits question

I can find b by using L'Hopital's Rule, where b is , but I don't know how to find a - May 2nd 2010, 01:15 AMDebsta
- May 2nd 2010, 01:52 AMacevipa
- May 2nd 2010, 03:09 AMHallsofIvy
I'm not clear how you can use L'Hopital and NOT get a. Differentiating both numerator and denominator, gives and using L'Hopital's rule again, which has a limit of . In order for that to be 1, b must be .

**But**, in order that we be**able**to use L'Hopital a second time, on the fraction , since the denominator goes to 0, the numerator must also- we must have . That is a= -b. - May 2nd 2010, 03:31 AMDebsta