Respuesta :

Answer:

(x² - 3)(x² + 3)

Step-by-step explanation:

[tex]x^{4}[/tex] - 9 ← is a difference of squares and factors in general as

a² - b² = (a - b)(a + b) , thus

[tex]x^{4}[/tex] - 9

= (x² )² - 3²

= (x² - 3)(x² + 3)

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