Bonjour, besoin coup de main. Merci d'avance.

Bonjour,
                                4
              16                           -24
                          16-24=-8
                            -8+9=1
                               1=1²

                                 7
                  49                       -42
                           49-42=7
                               7+9=16
                                 16=4²

                              -5
                  25                            30
                                  25+30=55
                                      55+9=64
                                        64=8²

                                  x
                  x²                              -6x
                                  x²-6x
                                 x²-6x+9
                                  (x-3)²

(x-3)²=100
x-3=10                  ou x-3=-10
  x=10+3                    x=-10+3
    x=13                     x=-7

si x=13 le résultat sera 100
si x=-7 le résultat sera 100