Find f'(x) and f"(x). f(x)=9+ 3x – 3x^3

and

Step-by-step explanation:

In order to find the derivatives, first we need to remember that for polynomial functions:

, as well as that:

1. First derivative of the function:

using the property then

, remember that the derivative of a constant is equal to 0

2. Second derivative:

using the property then

In conclusion, and

step-by-step explanation:

47 - 90 = 43

43 - 180 = x

x = 137