Question

Resolve into factors:
81a4 - 16b4​

Answer 1

Step-by-step explanation:

(81a^4)-(16b^4)

=(9a^2)^2 -(4b^2)^2

=(9a^2-4b^2)(9a^2+4b^2)

={(3a)^2 -(2b)^2}(9a^2+4b^2)

=(3a-2b)(3a+2b)(9a^2 + 4b^2)