x²-12xy+36y²-6x+36y+8
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x²-12xy+36y²-6x+36y+8x²-12xy+36y²-6x+36y+8x²-12xy+36y²-6x+36y+8x²
x²-12xy+36y²-6x+36y+8
x²-12xy+36y²-6x+36y+8
x²-12xy+36y²-6x+36y+8
x²-12xy+36y²-6x+36y+8
=(x-6y)²-6(x-6y)+8
=(x-6y-2)(x-6y-4)