Try another version of this question Factor `25x^-8-16` `(` `x^-4+` `)(` `x^-4-` `)` `25x^-8-16 = ( 5 x^-4+ 4 )( 5 x^-4- 4 )`
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`(` `x^-4+` `)(` `x^-4-` `)`