Try another version of this question Factor `16x^-6-9` `(` `x^-3+` `)(` `x^-3-` `)` `16x^-6-9 = ( 4 x^-3+ 3 )( 4 x^-3- 3 )`
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`(` `x^-3+` `)(` `x^-3-` `)`