Derivative of 15-7^x

1. Differentiate $15 - 7^{x}$ term by term:

   1. The derivative of the constant $15$ is zero.

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

      1. $\frac{d}{d x} 7^{x} = 7^{x} \log{\left(7 \right)}$

      So, the result is: $- 7^{x} \log{\left(7 \right)}$

   The result is: $- 7^{x} \log{\left(7 \right)}$

The answer is:

$$- 7^{x} \log{\left(7 \right)}$$