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: Square $ABCD$ is inscribed in the region bound by the parabola $y = x^2 - 8x + 12$ and the $x$-axis, as shown below.  Find the area of square $ABCD.$

[asy]
unitsize(0.8 cm);

real parab (real x) {
  return(x^2 - 8*x + 12);
}

pair A, B, C, D;
real x = -1 + sqrt(5);

A = (4 - x,0);
B = (4 + x,0);
C = (4 + x,-2*x);
D = (4 - x,-2*x);

draw(graph(parab,1.5,6.5));
draw(A--D--C--B);
draw((1,0)--(7,0));

label("$A$", A, N);
label("$B$", B, N);
label("$C$", C, SE);
label("$D$", D, SW);
[/asy]
user