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Fungsi Komposisi dan Fungsi Invers- menentukan fungsi invers
- menentukan nilai dari fungsi invers
11.
Jika f(x) = (ax + b)/(cx + d) ,
maka f ⁻¹(x) = (dx - b)/(-cx + a)
Jika f(x) = (6x + 5)/(2x - 3) ,
maka f ⁻¹(x) = (-3x - 5)/(-2x + 6) = (3x + 5)/(2x - 6)
jawaban : B
12.
Jika f(x) = x² - 4x + 5
misal f ⁻¹ (5) = a , artinya f(a) = 5
a² - 4a + 5 = 5
a² - 4a = 0
a(a - 4) = 0
a = 0 atau a = 4
artinya f ⁻¹ (5) = 0 atau f ⁻¹ (5) = 4
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