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Subtract: 3a\ (a+b+c)-2b(a-b+c)from 4c(-...

Subtract: `3a\ (a+b+c)-2b(a-b+c)`from `4c(-a+b+c)`

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`3a\ (a+b+c)-2b(a-b+c)`from `4c(-a+b+c)`
`=4c(−a+b+c)−[3a(a+b+c)−2b(a−b+c)]`
`=4c(−a+b+c)−[3a^ 2 +3ab+3ac−2ab+2b^ 2−2bc]`
`=4c(−a+b+c)−[3a^ 2 +2b^ 2 +ab+3ac−2bc]`
`=−4ac+4bc+4c^2 −3a^2 −2b^2 −ab−3ac+2bc`
`=4c^2−3a^2−2b^2−ab+6bc−7ac`
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