Question

Раскройте скобки: (m-5)(3+m)(m+9)

Answer 1

(m-5)(3+m)(m+9) =
(3m+m^2-15-5m)(m+9) =
(m^2-2m-15)(m+9) =
m^3+9m^2-2m^2-18m-15m-135 =
m^3+7m^2-33m-135