Question

......................​

Answer 1

Answer:

here is your answer.

Step-by-step explanation:

please mark me brainlist answer.

Answer 2

Answer:

x^4-81y^4

Step-by-step explanation:

using identities (x+y)(x-y)=x^2-y^2

(x-3y)(x+3y)=(x^2-9y^2)*(x^2-9y^2)

using identities (x+y)(x-y)=x^2-y^2

x^4-81y^4