Question

Factorise 256a^4 - 81b^4

Answer 1

Step-by-step explanation:

Since both terms are perfect squares, factor using the difference of squares formula,

a2−b2 =(a+b)(a−b) where a=16a2 and b=9b2.

(16a2+9b2)(4a+3b)(4a-3b)