How do you factor (x^4 - 1) ..........?

Question

is there any formula for this type of stuff

Answer 1

(x² - 1) (x² + 1)

(x - 1) (x + 1) (x² + 1)

Answer 2

a^2 - b^2 = (a + b)(a - b)

x^4 - 1

= (x^2)^2 - (1^2)^2

= (x^2 + 1)(x^2 - 1)

= (x^2 + 1)(x + 1)(x - 1)

Answer 3

Its the difference of 2 squares

(x^2 + 1)(x^2 - 1)

= (x^2 + 1)(x + 1)(x - 1)