Derivative of 4e^(3x)

1. The derivative of a constant times a function is the constant times the derivative of the function.

   1. Let $u = 3 x$.

   2. The derivative of $e^{u}$ is itself.

   3. Then, apply the chain rule. Multiply by $\frac{d}{d x} 3 x$:

      1. The derivative of a constant times a function is the constant times the derivative of the function.

         1. Apply the power rule: $x$ goes to $1$

         So, the result is: $3$

      The result of the chain rule is:

      $$3 e^{3 x}$$

   So, the result is: $12 e^{3 x}$

The answer is:

$$12 e^{3 x}$$