Try another version of this question Factor `64x^-4-25` `(` `x^-2+` `)(` `x^-2-` `)` `64x^-4-25 = ( 8 x^-2+ 5 )( 8 x^-2- 5 )`
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`(` `x^-2+` `)(` `x^-2-` `)`