Question

Упростить выражение 3с(с+m)+3m(c-m)

Answer 1

$3c(c + m) + 3m(c - m) = 3(c(c + m) + m(c - m)) = 3( {c}^{2} + cm + cm { - m}^{2} ) = 3( {c}^{2} + 2cm - {m}^{2} ) = 3 {c + 6cm - {3m}^{2} }$