can you further factor x^4-81?

Question

the answer is (x^2-9)(x^2+9)
but can you factor more or not?

Answer 1

(x^2+9)(x^2-9)
(x^2+9)(x+3)(x-3)

Answer 2

You can further factor the (x^2-9) to (x+3)(x-3).

Answer 3

You still have one factor that is the difference of two squares.

(x^2-9)(x^2+9)
(x-3)(x+3)(x^2+9)

Answer 4

yes you can factor out one of these factors

(x^2-9) (x^2+9)
(x-3)(x+3)(x^2+9)

Answer 5

(x^2-9)(x^2+9)
(x+3)(x-3)(x^2+9)

Answer 6

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Answer 7

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