Question

Que numero es igual al cuadrado de otro y la suma de ambos es 42

Answer 1

1º   42-x

2º        x

   Planteamiento                42-x= x²

                                           x²+x-42=0

                                           (x+7)(x-6)=0

                                            x= -7

                                            x = 6 

Solución:    x1=-7      verificación        1º      42-x = 42-(-7)= 49

                                                             2º          x = -7

                                                                      ( -7)²= 49     OK

                    x2 = 6     verificación        1º       42-x = 42-6= 36

                                                             2ª            x = 6

                                                                            6² = 36     OK