Question

Tentukan himpunan penyelesaian dari |x| + |x - 5| = 7

Answer 1

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

|x| + |x-5| = -7
x + x = -7 + 5
2x = -2 
x = -1

{6, -1}