Question

Please answer these questions with explanation please my friends help me

Answer 1

Answer: 3a^2 + ab + 7ac + 2b^2 - 6bc - 4c^2

Step-by-step explanation:

Answer 2

let the expression be x.
According to question,
$x + 4c( - a + b + c) = 3a(a + b + c) - 2b(a - b + c) \\ \\ x = 3a( a + b + c) - 2b(a - b + c) - 4c(a - b - c) \\ x = {3a}^{2} + 3ab + 3ac - 2ab + {2b}^{2} - 2bc - 4ac + 4bc + {4c}^{2} \\ x = {3a}^{2} + {2b}^{2} + {4c}^{2} + ab + 2bc - ac.$
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