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Simplify : (2a+3b+4c) ( 4a^(2) + 9b^(...

Simplify `:`
`(2a+3b+4c) ( 4a^(2) + 9b^(2) + 16c^(2) -6ab - 12bc - 8ca ) `

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Simplify (i) ( 2a+3b +4c) (4a^(2) +9b^(2) +16c^(2) -6ab -12bc -8ca ) (ii) ( x-2y+3z ) ( x^(2) +4y ^(2) +9z^(2) +2xy +6yz -3xz )

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Factorise : 4a^(2)+9b^(2)+16c^(2)+12ab-24bc-16ca

If a + b- c = 4 and a^(2) + b^(2) + c^(2)= 38 , find ab- bc - ca