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Chain Rule, Log Differentiation & Rate of Change · Question 85 of 130

Question 85

MediumOriginal question

If f(x)=xxf(x) = x^{x}, what is f′(1)f'\left(1\right)?

Options for question 85

Show the answer and explanation
CorrectNot quiteAnswer B

Correct answer: B

Explanation

  1. f′(x)=xx(1+log⁡x)f'(x) = x^{x}(1 + \log x).

  2. At x=1x = 1: 1×(1+0)=11 \times (1 + 0) = 1.

Worth noting

0 keeps only log⁡1=0\log 1 = 0 and forgets the 1 beside it.

Concept
Logarithmic differentiation at a point
Typical time
90 s
Your time
—
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.