Penyelesaian dari |5x-4|=8 (nilai mutlak)

Materi : Nilai Mutlak
Bahasan : Persamaan Nilai Mutlak
Jawaban : x = 12/5 atau x = - 4/5

Langkah - langkah :
|f(x)| = a, ⇒ f(x) = a atau f(x) = - a
|5x - 4| = 8
⇒ 5x - 4 = 8
5x - 4 = 8
5x = 12
x = 12/5
⇒ 5x - 4 = - 8
5x - 4 = - 8
5x = - 4
x = - 4/5

|5x-4| = 8
(5x-4)^2 = 8^2
[(5x-4)+8] [(5x-4)-8]
5x+4 √ 5x-12
5x = -4 √ 5x = 12
X = -4/5 √ x =12/5