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 determine the values of \( x \) for which the expression under the square root is non-negative. This is because the square root function is defined only for non-negative values.

### Step-by-Step Solution:

1. **Set the expression under the square root greater than or equal to zero**:
\[ 64 - x^2 \geq 0 \]
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