Question

Rozwiąż metoda algebraiczna

Ix+2I=7-IxI

ma wyjść x nalezy { 2,5 ; -4,5}

Answer 1

x+2=7-x                            x+2= -7-x

2x=7-2                              x+x=-7-2

2x=5/2                              2x=-9/2

x=2.5                                 x=-4.5

 x należy (2.5, 4.5)

Answer 2

x+2 =7-x       U      -x-2=7+x

x+x=5                  -2x=9

2x=5                    x=-4,5

x=5/2   

                 x∈{-4,5 ,  2,5}