Solve the following math problem efficiently and clearly:

- For simple problems (2 steps or fewer):
Provide a concise solution with minimal explanation.

- For complex problems (3 steps or more):
Use this step-by-step format:

## Step 1: [Concise description]
[Brief explanation and calculations]

## Step 2: [Concise description]
[Brief explanation and calculations]

...

Regardless of the approach, always conclude with:

Therefore, the final answer is: $oxed{answer}$. I hope it is correct.

Where [answer] is just the final number or expression that solves the problem.

Problem: The parabola with equation $y=ax^2+bx+c$ is graphed below:

[asy]
xaxis(-3,7);

yaxis(-5,32);

real g(real x)

{

return 4(x-2)^2-4;
}

draw(graph(g,-1,5));
dot((2,-4));
label("Vertex: $(2,-4)$", (2,-4), SE);
dot((4,12));
label("$(4,12)$", (4,12), E);
[/asy]

The zeros of the quadratic $ax^2 + bx + c$ are at $x=m$ and $x=n$, where $m>n$. What is $m-n$?
user