Question

a^4-81b^4 please solve fast as possible it's urgent
​

Answer 1

Answer:

a^4-81b^4

=(a^2)^2-(9b^2)^2

=(a^2+9b^2)(a^2-9b^2)

=(a^2+9b^2){(a)^2-(3b)^2}

=(a^2+9b^2)(a+3b)(a-3b)