Решить уравнениеX^3+2X^2-9X-18=0

( X^3 + 2X^2) - ( 9X + 18) = 0  X^2 * ( X + 2 ) - 9 * ( X + 2 ) = 0  ( X + 2 ) * ( X^2 - 9 ) = 0  ( X + 2 ) * ( X - 3 ) * ( X + 3 ) = 0 ---------------------------------------- X + 2 = 0 ---> X = ( - 2 )  ---------------------------------------- X - 3 = 0 ---> X = 3  ---------------------------------------- X + 3 = 0 ----> X = ( - 3 ) ============================ Ответ: ( - 2); ( - 3 ) ; 3