Try another version of this question Factor `49x^-6-16` `(` `x^-3+` `)(` `x^-3-` `)` `49x^-6-16 = ( 7 x^-3+ 4 )( 7 x^-3- 4 )`
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`(` `x^-3+` `)(` `x^-3-` `)`