Try another version of this question Factor `9x^-8-4` `(` `x^-4+` `)(` `x^-4-` `)` `9x^-8-4 = ( 3 x^-4+ 2 )( 3 x^-4- 2 )`
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`(` `x^-4+` `)(` `x^-4-` `)`