What is the derivative of f(x) = (3x - 2)^5?
Correct answer: B. 15(3x - 2)^4
- A. 5(3x - 2)^4
- B. 15(3x - 2)^4
- C. 15(3x - 2)^5
- D. (3x - 2)^4
Explanation
The chain rule multiplies the outer derivative by the derivative of 3x - 2. Therefore, f'(x) = 5(3x - 2)^4 × 3 = 15(3x - 2)^4.
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About Differentiation and Optimisation
Differentiation covers gradients, standard derivative rules, the product and quotient rules, the chain rule, stationary points and rates of change. Optimisation uses first and second derivatives to classify maxima and minima, while applications include tangent and normal lines, marginal quantities and related rates.
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