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Verified answer

[tex](16 - 4 {y}^{2} + {y}^{4})( {y}^{2} + 4) [/tex]

[tex]( {y}^{4} - 4 {y}^{2} + 16) \times ( {y}^{2} + 4) [/tex]

[tex] {y}^{6} + 64[/tex]