Question

expanel : (3a - 2b + c)2​

Answer 1

Answer:

$(3a - 2b + c)^{2} \\= (3a - 2b + c)(3a - 2b + c)\\= 3a(3a - 2b + c) - 2b(3a - 2b + c) + c(3a - 2b + c)\\= 9a^2 - 6ab + 3ac - 6ab + 4b^2 - 2bc + 3ac - 2bc + c^2\\= 9a^2 + 4b^2 + c^2 - 12ab - 4bc + 6ac$