Step-by-step explanation:

(2x+y)²-4(2x+y) +3

..

let (2x+y)=a

a²-4a+3

a²-3a-a+3

a(a-3)-1(a-3)

(a-1)(a-3)

replace the value of a with 2x+y

(2x+y-1)(2x+y-3)

Step-by-step explanation:

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