To solve the quadratic equation \(x^2 - 16x + 64 = 0\) using the perfect square trinomial pattern, we can recognize that the left side can be factored as follows:
\[ x^2 - 16x + 64 = (x - 8)^2 \]
So, we rewrite the equation:
\[ (x - 8)^2 = 0 \]
Next, we take the square root of both sides:
\[ x - 8 = 0 \]
Solving for \(x\), we get:
\[ x = 8 \]
Thus, the solution to the equation is:
\[ \boxed{8} \]
So the correct response is \(x = 8\).