Try another version of this question Factor `81x^-8-25` `(` `x^-4+` `)(` `x^-4-` `)` `81x^-8-25 = ( 9 x^-4+ 5 )( 9 x^-4- 5 )`
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`(` `x^-4+` `)(` `x^-4-` `)`