Question

factorisation.
4 ( 2x - y ) 2 - 36 ( 2x - y ) +81​

Answer 1

Step-by-step explanation:

let 2x+y be a

the equation becomes

4a^2-36a+81

4a^2-18a-18a+81

2a(2a-9)-9(2a-9)

(2a-9)^2

(2{2x-y}-9)^2

(4x-2y-9)(4x-2y-9)