Can anyone solve the 19th question

Can anyone solve the 19th question 16. - 1 — 20 — 22. 2) - - 2)

Dear Student,
=x2-4x+4y-y2=x2-y2-4x+4y=(x-y)(x+y)-4(x-y)=(x-y)[(x+y)-4]=(x-y)(x+y-4)
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