Factorize : x2-4x+4y-y2

Matching exercise

    
Match the items on the right to the items on the left.
Step 1
Step 2
Step 3
Step 4
x2-4x+4y-y2=x2-y2-4x-4y
=x-yx+y-4(x-y)
=x-y(x+y)-4
=x-y(x+y-4)