factorise :3x²-y²+z²-2xy-4xz
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3x²-y²+z²-2xy-4xz
=3x²-2xy-y²+z²h-4xz
=(3x²-2x-y²)+ z² - 4xz
=( 3x+y) (x-y)+ z(z-4x)
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