Derivative of y=(8x-15)^5

1. Let $u = 8 x - 15$.

2. Apply the power rule: $u^{5}$ goes to $5 u^{4}$

3. Then, apply the chain rule. Multiply by $\frac{d}{d x} \left(8 x - 15\right)$:

   1. Differentiate $8 x - 15$ term by term:

      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: $8$

      2. The derivative of the constant $-15$ is zero.

      The result is: $8$

   The result of the chain rule is:

   $$40 \left(8 x - 15\right)^{4}$$

4. Now simplify:

   $$40 \left(8 x - 15\right)^{4}$$

The answer is: