Răspuns :
|2x-1|=19
2x - 1 = 19 2x - 1 = - 19
2x = 19 + 1 2x = - 19 + 1
2x = 20 2x = - 18
x = 20 : 2 2x = - 18 : 2
x = 10 x = - 9
S = { -9; 10 }
|2x-1|=19
2x-1=19
-(2x-1)=19
2x=19+1=20
[tex]x = \frac{20}{2} = 10[/tex]
-2x+1=19
-2x=19-1=18
[tex]x = - \frac{18}{2} = - 9[/tex]
S={10,-9}
2x-1=19
-(2x-1)=19
2x=19+1=20
[tex]x = \frac{20}{2} = 10[/tex]
-2x+1=19
-2x=19-1=18
[tex]x = - \frac{18}{2} = - 9[/tex]
S={10,-9}