Answer:
[tex]( {x}^{3} - 3)( {x}^{3} + 3)[/tex]
Step-by-step explanation:
[tex] {x}^{6} - 9 = {( {x}^{3} )}^{2} - {3}^{2} [/tex]
[tex] = ( {x}^{3} - 3)( {x}^{3} + 3)[/tex]