Question

calcular el valor de k sabiendo que el modulo del vector v=(k,3) es 5

Answer 1

  Sea un vector v = (a,b)  su módulo es |v| = √(a²+b²)

                         v = (k,3) su módulo es   5 = √(k² + 3²)

                                                                5 = √(k² + 9)

                                                              25 = k² + 9

                                                        25 - 9 = k²

                                                               k² = 16

                                                               k = +4    y   k = -4

                                                           Dos soluciones