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Derivatives & Second-Order Derivatives · Question 18 of 96

Question 18

MediumOriginal question

Differentiate x3log⁡xx^{3} \log x with respect to xx.

Options for question 18

Show the answer and explanation
CorrectNot quiteAnswer D

Correct answer: D

Explanation

  1. Product rule: (uv)′=u′v+uv′(uv)' = u'v + uv', with u=x3u = x^{3} and v=log⁡xv = \log x.

  2. (3x2)(log⁡x)+(x3)(1x)=3x2log⁡x+x2(3 x^{2})(\log x) + (x^{3})(\frac{1}{x}) = 3 x^{2} \log x + x^{2}.

Worth noting

3x3 x multiplies the two derivatives, which is not the product rule.

Concept
The product rule
Typical time
90 s
Your time
—
The rule this testsThe rules of differentiation
Practise this chapter →

Ten questions from Derivatives & Second-Order Derivatives, at your own pace.

Practise this chapter →

Ten questions from Derivatives & Second-Order Derivatives, at your own pace.