X^3 + 2X^2 = 4X + 8 X^2 * ( X + 2 ) = 4 * ( X + 2 ) X^2 = 4 X1 = 2 X2 = - 2 --------------- X + 2 ≠ 0 ; X ≠ - 2 --------------- Ответ Х = 2