(b) 6xy - y2 + 12x2 - 2yz
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6xy - y2 + 12xz - 2yz
= 6y (6x - y) +2z(6x - y)
(6x - y)(6y + 22)
= (6x -y) 2(3y + 2)
2(6x - y)(3y + z)
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