Factorise 4x²+y²+9z²-4xy-6yz+12zx

1.	Factorise 4x²+y²+9z²-4xy-6yz+12zx
Answer» 4x²+y²+9x²-4xy+6yz-12zx=(2x)²+(-y)²+(-3z)²+2(2z)(-y)+2(-y)(-3z)+2(-3z)(2x)=(2x-y-3z)²=(2x-y-3z)(2x-y-3z)

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