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 rewritten as a square.
The equation can be expressed as:
\[ (x - 8)^2 = 0 \]
This means that:
\[ x - 8 = 0 \]
Solving for \( x \) gives:
\[ x = 8 \]
Therefore, the solution to the equation is \( x = 8 \).
The correct answer is A. x = 8.
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