Limit 0/0

Calculus Level 2

Evaluate lim x e x x 9 . \lim_{x \to \infty} \frac{e^{-x}}{x^{-9}}.

1 9 1 9 \frac{1}{9} 0

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1 solution

Tom Engelsman
Jul 10, 2016

The above function can be rewritten as x^9 / e^x. Applying L'Hoptial's Rule nine times each eventually yields 9! / e^x, which yields zero as x approaches infinity.

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