Differentiate with respect to .
Answer and explanation
Correct answer: C.
- Step 1: Multiply each power by its coefficient and reduce the power by one. Step 2. , , and the constant . **Answer: . Why not the others:** keeping the 7 forgets that a constant differentiates to zero; drops the multiplication by the old power; forgets to lower the power.
Practise more Differentiation and integration.
Free questions with an explanation for every one, and full timed A-Level UK (AQA, Edexcel, OCR) mock tests.