Find the domain of the given function.
-$$f ( x ) = \sqrt { x ^ { 4 } - 81 x ^ { 2 } }$$
A) $( - \infty , - 9 ] \cup [ 9 , \infty )$
B) $( - \infty , - 9 ] \cup [ 0 ] \cup [ 9 , \infty )$
C) $( - \infty , \infty )$
D) $( - \infty , - 9 ) \cup ( 9 , \infty )$

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The Answer of Find the domain of the given function.
-$$f ( x ) = \sqrt { x ^ { 4 } - 81 x ^ { 2 } }$$
A) $( - \infty , - 9 ] \cup [ 9 , \infty )$
B) $( - \infty , - 9 ] \cup [ 0 ] \cup [ 9 , \infty )$
C) $( - \infty , \infty )$
D) $( - \infty , - 9 ) \cup ( 9 , \infty )$

Find the Domain of the Given Function f(x)=x4−81x2f ( x ) = \sqrt { x ^ { 4 } - 81 x ^ { 2 } }f(x)=x4−81x2​

Find the Domain of the Given Function $f ( x ) = \sqrt { x ^ { 4 } - 81 x ^ { 2 } }$