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Idealist

  • 3 years ago

Find lim as x approaches to positive infinity for x^5/e^5x.

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  1. Asad0000
    • 3 years ago
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    infinity

  2. Idealist
    • 3 years ago
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    The answer is 0, though.

  3. wio
    • 3 years ago
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    This is an indeterminate form, so you need to use l'Hospital 5 times. An exponential function will beat out a polynomial eventually.

  4. wio
    • 3 years ago
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    Basically, the polynomial eventually will become a constant, while the exponential function will remain an exponential function. That leaves you with a constant divided by infinity... which is 0.

  5. LogicalApple
    • 3 years ago
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    Notice that the polynomial's 5th derivative is constant, but the denominator's derivative continues to increase.

  6. Idealist
    • 3 years ago
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    Thank you, guys. I didn't do up to 5th derivative, that's why I was confused.

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