Question

x^8-(1/81)

Answer 1

hint: first treat as the difference of 2 squares

Answer 2

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

Answer 3

I'm trying to find the factor.
(x4 + )(x2 + )(x2 - )
(x4 - )(x2 + )(x2 - )
(x4 + )(x2 - )2

These are the answers to pick from.

Answer 4

x^8-(1/81)
= (x^4 + 9)(x^4 - 9)

now try to apply the formula I posted to the second parentheses and see what you get