Try another version of this question Factor `81x^-6-4` `(` `x^-3+` `)(` `x^-3-` `)` `81x^-6-4 = ( 9 x^-3+ 2 )( 9 x^-3- 2 )`
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`(` `x^-3+` `)(` `x^-3-` `)`