Question

find the product of one into Z square + 4 into z square - 5​

Answer 1

$( {z}^{2} + 4)( {z}^{2} - 5) \\ {z}^{2}( {z}^{2} - 5) + 4( {z}^{2} - 5) \\ {z}^{4} - 5 {z}^{2} + 4 {z}^{2} - 20 \\ {z}^{4} - {z}^{2} - 20 \\ hope \: it \: clear \\ \\ keep \: learning \: keep \: studing$