10X = 3 * ( X^2 - 19) 3X^2 - 10X - 57 = 0 D = 100 + 684 = 784 √ D = 28 X1 = ( 10 + 28 ) : 6 = 38/6 = 19/3 = 6 1/3 X2 = ( 10 - 28) : 6 = ( - 18) : 6 = ( - 3 ) X2 < X1 Ответ ( - 3 )