Question

Factor
x^4-81

Answer 1

hint:

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

Answer 2

im sorry I just don't think I understand

Answer 3

another hint:

x^4-81

(x^2)^2-9^2

Answer 4

oh I see now thankyou very much

Answer 5

np

Answer 6

\[(x ^{2}-9)(x ^{2}+9)\]