# Chapter 2 - Differentiation - 2.2 Exercises: 16

The derivative is $4-9x^2$.

#### Work Step by Step

Whenever two or more functions are being added or subtracted, the overall derivative would be the sum of the derivatives of every smaller function . The derivative of 4x is 4 and the derivative of $-3x^3$ is $-9x^2$ hence the overall derivative is $4-9x^2$.

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