Question

(3a-7b-c)^2 simplely​

Answer 1

solution

$(3a - 7b - c) {}^{2} \\ = (3a) {}^{2} + ( - 7b) {}^{2} + ( - c) {}^{2} + 2(3a)( - 7b) + 2( - 7b)( - c) + 2( - c)(3a) \\ = 9a {}^{2} + 49b {}^{2} + c {}^{2} - 42ab + 14bc - 6ca$

Answer 2

Hope u understand it......