Question

Tentukan himmpunan dari:
1. | 2x-5 | = 7
2. | 2x-1 | = | 2-3x |
3. | 3-1/4x | = 1
Tolong dijawab yah:)

Answer 1

1.|2x-5| = 7     
   2x-5 = 7        2x-5=-7
   2x = 7+5        2x = -7+5
   2x = 12          2x = -2
   x = 6              x= -1

Answer 2

1.
2x-5 = 7
2x = 12
x = 6
atau
-(2x-5) = 7
-2x + 5 = 7
-2x = 2 
x = -1

2. 
2x-1 = 2-3x
2x+3x = 2+1
5x = 3
x = 3/5
atau
-(2x-1) = 2-3x
-2x+1 = 2-3x
-2x+3x = 2-1
x = 1

3.
3-1/4x  = 1
-1/4x = 1-3
1/4x = 2
x = 2*4 = 8

atau 
-(3-1/4x) = 1
-3 + 1/4x = 1
1/4x = 4
x = 4*4 = 16