Simplify: `x(x+4)+3x(2x^2-1)+4x^2+4`

Explanation

To simplify the expression \( x(x+4) + 3x(2x^2 - 1) + 4x^2 + 4 \), we will follow these steps:

### Step 1: Distribute the terms
First, we will distribute the terms in the expression.

- For \( x(x + 4) \):
\[
x^2 + 4x
...