Question

Factor.

Answer 1

Answer:

(x² - 3)(x² + 3)

Step-by-step explanation:

$x^{4}$ - 9 ← is a difference of squares and factors in general as

a² - b² = (a - b)(a + b) , thus

$x^{4}$ - 9

= (x² )² - 3²

= (x² - 3)(x² + 3)