Factorise:
1. 4x²+9y²+16z²+12xy-24yz-16xz
2. 2x²+y²+8z²-2²xy+42²yz-8xz
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Step-by-step explanation:
4x²+9y²+16z²+12xy-24yz-16xz
2. 2x²+y²+8z²-2²xy+42²yz-8xz
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