Question

fatorando 7a -7c+ma-mc obtemos :a) (a+c)(7+m) b) (a-c)(7+m) c) (a+7)(c-m) d) (7+c)(a+m)

Answer 1

   7a - 7c + ma - mc =
   7(a - c) + m(a - c) =
   (7 + m) (a - c)  <---   opção b)