Find the domain of definition of the function `f(x) = sqrt(64 - x^(2))`.

Explanation

To find the domain of the function \( f(x) = \sqrt{64 - x^2} \), we need to ensure that the expression inside the square root is non-negative. This is because the square root function is only defined for non-negative values.

### Step 1: Set up the inequality
We start with the condition that the expression inside the square root must be greater than or equal to zero:
\[ 64 - x^2 \geq 0 \]

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