Por diferencia de cuadrados
[tex](3 {x}^{4} - 4)(3 {x}^{4} + 4) = (3 {x}^{4} )^{2} - (4)^{2} \\ = 9 {x}^{8} - 16[/tex]
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Por diferencia de cuadrados
[tex](3 {x}^{4} - 4)(3 {x}^{4} + 4) = (3 {x}^{4} )^{2} - (4)^{2} \\ = 9 {x}^{8} - 16[/tex]