Not as easy as it seems

Calculus Level 2

lim x x ln ( x ) = ? \large \lim_{x\to\infty} x^{\ln(x)} = \ ?

0 \infty e -\infty π 2 \frac\pi2 1

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2 solutions

Micah Wood
Jun 24, 2015

We know that ln x > 1 \ln x > 1 for x > 3 x>3

So x ln x > x 1 = x x^{\ln x} > x^1=x for x > 3 x>3

Since lim x x = \displaystyle \lim_{x\to\infty}x = \infty , we have lim x x ln x = \lim_{x\to\infty}x^{\ln x} = \infty

Alex Li
Jun 16, 2015

Both x x and ln ( x ) \ln(x) grow arbitrarily large as x x approaches \infty , so the limit is \boxed{\infty} .

right , please provide a valid solution

Shashank Rustagi - 5 years, 12 months ago

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