Question

factorise 4xsquare - 81ysquare

Answer 1

4x^2 - 81y^2 = 0
 [ 2x + 9y ] [ 2x - 9y ] = 0

hope this helps....

Answer 2

4x^2-81y^2
(2x)^2-(9y)^2
a^2-b^2=(a+b)(a-b)
=(2x+9y)(2x-9y)

hope this helps
pls mark as brainliest