Question

Determinati X*Q pentru care | 2x-3|=5. | 4X-3|=33

Answer 1

|2x-3|=5=> 2x-3=5
                =>x=4
si
2x+3=-5
x=-4

|4x-3|=33 => 4x-3=33
                     x=9
si 4x-3=-33
x=-9

                   

Answer 2

|2x-3|=5
2x-3=5
2x=5+3
2x=8
x=8/2
x=4
2x-3=-5
2x=-5+3
2x=-2
x=-2/2
x=-1
x aparține {-1, 4}

|4x-3|=33
4x-3=33
4x=33+3
4x=36
x=36/4
x=9
4x-3=-33
4x=-33+3
4x=-30
x=-30/4
x=-7,5 nu aparține Q*
S={-1, 4, 9}