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Materi : Nilai MutlakBahasan : Persamaan Nilai Mutlak
Jawaban : x = 3 atau x = 4/3
Langkah - langkah :
|f(x)| = a ⇒ f(x) = a atau f(x) = - a
|(x + 2) / (x - 2)| = 5, memiliki :
a. |(x + 2) / (x - 2)| = 5
⇒ (x + 2) / (x - 2) = 5
⇒ (x + 2) = 5(x - 2)
⇒ x + 2 = 5x - 10
⇒ - 5x + x = - 10 - 2
⇒ - 4x = - 12
⇒ x = 3
b. |(x + 2) / (x - 2)| = - 5
⇒ (x + 2) = - 5(x - 2)
⇒ x + 2 = - 5x + 10
⇒ 5x + x = 10 - 2
⇒ 6x = 8
⇒ x = 8/6
⇒ x = 4/3