Determine the domain of the function f(x) = √x x² - 64 (Give your answer as an interval in the form (*, *). Use the symbol oo for infinity, U for combining intervals, and an appropria type of parenthesis " (", ") ", " [", "]" depending on whether the interval is open or closed. Enter Ø if the interval is empty. Express numbers in exact form. Use symbolic notation and fractions where needed.) Write co for positive infinity (without a '+' sign).

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