Limits Continuity And Differentiability Question 17

Question: What is the derivative of $ x^{3} $ with respect to $ x^{2} $ ?

Options:

A) $ 3x^{2} $

B) $ \frac{3x}{2} $

C) x

D) $ \frac{3}{2} $

Show Answer

Answer:

Correct Answer: B

Solution:

$ U=x^{3} $

$ \frac{dU}{dx}=3x^{2}…(1) $

$ V=x^{2} $

$ \frac{dV}{dx}=2x….(2) $ From (1) and (2) $ \frac{dU}{dV}=\frac{3x^{2}}{2x}=\frac{3}{2}x $