Question

rezolvați ecuația |2x-1|=19

Answer 1

|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 }

Answer 2

|2x-1|=19

2x-1=19

-(2x-1)=19

2x=19+1=20

$x = \frac{20}{2} = 10$

-2x+1=19

-2x=19-1=18

$x = - \frac{18}{2} = - 9$

S={10,-9}