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Chain Rule, Log Differentiation & Rate of Change · Question 81 of 130

Question 81

EasyOriginal question

What is ddx(xx)\frac{d}{dx}\left(x^{x}\right) for x>0x > 0?

Options for question 81

Show the answer and explanation
CorrectNot quiteAnswer D

Correct answer: D

Explanation

  1. Take logs: log⁡y=xlog⁡x\log y = x\log x, so 1ydydx=log⁡x+1\frac{1}{y}\frac{dy}{dx} = \log x + 1.

  2. dydx=xx(1+log⁡x)\frac{dy}{dx} = x^{x}(1 + \log x).

Worth noting

x⋅xx−1x \cdot x^{x - 1} treats the power as a constant; here the power varies too.

Concept
Logarithmic differentiation
Typical time
60 s
Your time
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The rule this testsLogarithmic differentiation
Practise this chapter →

Ten questions from Chain Rule, Log Differentiation & Rate of Change, at your own pace.

Practise this chapter →

Ten questions from Chain Rule, Log Differentiation & Rate of Change, at your own pace.