Question

. Factorise :-
X⁴ - 81​

Answer 1

${x}^{4} - 81 \\ = > {(x)}^{4} - {(3)}^{4} \\ = > ({x}^{2} + {3}^{2} )( {x}^{2} - {3}^{2} ) \\ = > ({x}^{2} + {3}^{2} )(x + {3} )(x - {3} )$

Answer 2

x⁴ – 81

( x² )² – ( 9 )²

( x² + 9 ) ( x² – 9 )

( x² + 9 ) ( x – 3 ) ( x + 3 )