Derivative of x^x

Calculus Level 1

Find the derivative of x x x^x at x = 1 x=1 .


The answer is 1.

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4 solutions

Isaac Buckley
Sep 25, 2015

f ( x ) = x x = e x ln ( x ) f(x)=x^x=e^{x\ln(x)} f ( x ) = ( ln ( x ) + 1 ) e x ln ( x ) = ( ln ( x ) + 1 ) x x \therefore f'(x)=(\ln(x)+1)e^{x\ln(x)}=(\ln(x)+1)x^x f ( 1 ) = ( ln ( 1 ) + 1 ) × 1 1 = 1 \implies f'(1)=(\ln(1)+1)\times1^1=\boxed{1}

Wzesen Wvosky
Feb 20, 2019

Let's say, y=x^x

thus, lny =ln(x^x)

ln y = x.lnx

By differentiating,

(1/y)*dy/dx = lnx + 1 (chain rule and uv for second part)

Thus, dy/dx= y*((lnx)+1)

Because y=x^x,

The result is (x^x)*((lnx)+1)

Now plug in values

Angel Shaju
Apr 19, 2018

Derivative of 3x^2

Aaaaa Bbbbb
Sep 24, 2015

( x x ) = x x 1 + x x l o g ( x ) ( x = 1 ) = 1 (x^x)'=x^{x-1}+x^x log(x) |(x=1) = \boxed{1}

Not quite - you need to account for the x that's being raised to the power x, and log(1) = 0.

Tom Dodd - 5 years, 8 months ago

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