If `y=7x-x^3` and `x` increases at the rate of `4` units per second, how fast is the slope of the curve changing when `x=2` ?

Explanation

To find how fast the slope of the curve is changing when \( x = 2 \) for the function \( y = 7x - x^3 \), we can follow these steps:

### Step 1: Differentiate the function with respect to \( x \)

Given:
\[ y = 7x - x^3 \]
...