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x²-2x-4y²-4y
=(x^2-4y^2)-(2x+4y)
=(x+2y)(x-2y)-2(x+2y)
=(x+2y)(x-2y-2)
x²-3xy-18y²-3x-9y
=(x²-3xy-18y²)-(3x+9y)
=(x-6y)(x+3y)-3(x+3y)
=(x+3y)(x-6y-3)
=(x^2-4y^2)-(2x+4y)
=(x+2y)(x-2y)-2(x+2y)
=(x+2y)(x-2y-2)
x²-3xy-18y²-3x-9y
=(x²-3xy-18y²)-(3x+9y)
=(x-6y)(x+3y)-3(x+3y)
=(x+3y)(x-6y-3)
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