Question

Решите уравнения срочно надо
х2 -14х + 40 =0;
  12m2 +m -6 =0;

 x2+ 6x -2 =0; 
 3x2 - 4x - 5 =0;

Answer 1

вот решение
                                                                                        -40=49-40=9=3^2                                                                                        X1=7+3=10                                                                                        X2=7-3=4                                                                                        D=1-4*12*(-6)=1+288=289=17^2                                                                                        X1=                                                                                        X2=                                                                                                                                                                               D1=9+2=11                                                                                        X1=                                                                                          X2=                                                                                        D1=4-15=-11                                                                                        Нет корней