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2x-x=1+4
x =5
maka, nilai x=5
2x - 4, jika x ≥ 0 x + 1, jika x ≥ 0
-(2x - 4), jika x < 0 -(x + 1), jika x < 0
Dicoba :
a. 2x - 4 = x + 1 ⇒ |2x - 4| = |x + 1|
x = 5 |2(5) - 4| = |(5) + 1|
|10 - 4| = |6| ⇒ Benar
b. 2x - 4 = -(x + 1) ⇒ |2x - 4| = |x + 1|
2x - 4 = -x - 1 |2(1) - 4| = |(1) + 1|
3x = 3 |2 - 4| = | 2 |
x = 1 | -2 | = | 2 |
2 = 2 ⇒ Benar
Berarti :
HP = {1,5}