Answer :

Given,


2(x+y)2 – 9(x+y) – 5,


= 2a2 -9a – 5


Let (x+y) = a


= 2a2 – 10a+a – 5


= 2a (a-5) +1(a-5)


= (2a+1) (a-5)


= {2(x+y)+1}(x+y-5)


(2x+2y+1) (x+y-5)


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