subtract 3a(a+b+c)-2b (a-b+c) from 4c (-a+b+c) please give explanation

Question

subtract 3a(a+b+c)-2b (a-b+c) from 4c (-a+b+c)                                please give explanation​

Sarah · Answer

Answer:   solution, 3a(a+b+c)-2b(a-b+c)  =3a²+3ab+3ac-2ab+2b²-2bc  =(3a²+2b²+ab+3ac-2bc)-4c(-a+b+c)  =3a²+2b²+ab+3ac-2bc+4ac-4bc-4c²  =3a²+2b²+ab+7ac-6ac-4c²

Isabelle

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subtract 3a(a+b+c)-2b (a-b+c) from 4c (-a+b+c) please give explanation​