Find the area bounded by `y=-x^(3)+x^(2)+16x and y=4x`

Explanation

To find the area bounded by the curves \( y = -x^3 + x^2 + 16x \) and \( y = 4x \), we will follow these steps:

### Step 1: Find the points of intersection
To find the points where the curves intersect, we set the equations equal to each other:

\[ -x^3 + x^2 + 16x = 4x \]
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