Find the slope of the tangent to the curve `y=3x^4-4x`at `x = 4`.

Explanation

To find the slope of the tangent to the curve \( y = 3x^4 - 4x \) at \( x = 4 \), we will follow these steps:

### Step 1: Differentiate the function
We need to find the derivative of the function \( y \) with respect to \( x \). The derivative \( \frac{dy}{dx} \) gives us the slope of the tangent line at any point on the curve.

Given:
\[
y = 3x^4 - 4x
...