TUGAS MUTLAK NILAI MATEMATIKA

 NAMA: Muhammad Reviyata Satria Putra Prawira

KELAS: X IPS 2

ABSEN: 19

Nilai Mutlak

Definisi nilai mutlak :

|x| = x jika x ≥ 0

|x| = -x jika x < 0


|x| = √(x²)


Persamaan nilai mutlak (c > 0)

1) |ax + b| = c

=> ax + b = c atau ax + b = -c

2) |ax + b| = |cx + d|

=> (ax + b)² = (cx + d)²


Pertidaksamaan nilai mutlak (a > 0, c > 0)

1) |ax + b| < c

=> -c < ax + b < c

2) |ax + b| > c

=> ax + b < -c atau ax + b > c

3) |ax + b| < |cx + d|

=> (ax + b)² < (cx + d)²


Contoh soal :

1) Himpunan penyelesaian dari persamaan |2x + 3| = |x + 6| adalah ...

Jawab :

|2x + 3| = |x + 6|

(2x + 3)² = (x + 6)²

4x² + 12x + 9 = x² + 12x + 36

3x² - 27 = 0

x² - 9 = 0

(x + 3)(x - 3) = 0

x = -3 atau x = 3

HP = {-3, 3}


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