8 9*x
d / 8\ --\9*x / dx
The derivative of a constant times a function is the constant times the derivative of the function.
Apply the power rule: x8x^{8}x8 goes to 8x78 x^{7}8x7
So, the result is: 72x772 x^{7}72x7
The answer is:
7 72*x
6 504*x
5 3024*x