Asked by Kate
Using l'hopital's rule, find the limit as x approaches zero of
(e^(6/x)-6x)^(X/2)
I know l'hopital's rule, but this is seeming to be nightmare. I just don't seem to get anywhere.
I mistyped the first time I posted this question.
(e^(6/x)-6x)^(X/2)
I know l'hopital's rule, but this is seeming to be nightmare. I just don't seem to get anywhere.
I mistyped the first time I posted this question.
Answers
Answered by
MathMate
This is not an obvious one.
(I changed the uppercase X to lowercase x)
Lim x->0 (e^(6/x)-6x)^(x/2)
At first glance, as x->0, 6/x->∞ and 6x->0.
By comparison of the two terms, the -6x term can be removed to give:
Lim x->0 (e^(6/x))^(x/2)
By the use of the laws of exponent, the above expression reduces to:
Lim x->0 e^(6x/2x)
Apply d'Hôpital's rule to the exponent, we get
Lim x->0 e^(6/2)
=e^3
(I changed the uppercase X to lowercase x)
Lim x->0 (e^(6/x)-6x)^(x/2)
At first glance, as x->0, 6/x->∞ and 6x->0.
By comparison of the two terms, the -6x term can be removed to give:
Lim x->0 (e^(6/x))^(x/2)
By the use of the laws of exponent, the above expression reduces to:
Lim x->0 e^(6x/2x)
Apply d'Hôpital's rule to the exponent, we get
Lim x->0 e^(6/2)
=e^3
Answered by
Kate
Thank you so much! I didn't think to remove the 6x.
So helpful, thank you!!
So helpful, thank you!!
Answered by
Kate
Here's what's weird: I graphed the equation and from the left the function approaches 1 as x approaches zero, and from the right it approaches e^3. Doesn't that mean the limit does not exist? The question, however, is multiple choice, with choices of infinity, 0, 3, 1, and e^3.
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