Soal Simulasi Ujian IPS Kelas 12
Tahun 2018Soal Pilihan Ganda
18. Diketahui f(x) = (2x-3) / (4-5x) , x ≠ 4/5 , Invers fungsi f(x) adalah
A. f-1(x) = (2x+3)/(5x+4) , x ≠ - 4/5
B. f-1(x) = (4x+3)/(5x+2) , x ≠ - 2/5
C. f-1(x) = (3x-4)/(5x+2) , x ≠ - 2/5
D. f-1(x) = (3x-2)/(5x+4) , x ≠ - 4/5
E. f-1(x) = (5x-4)/(4x+3) , x ≠ - 3/4
Jawaban : B
y = (2x-3) / (4-5x)
y (4-5x) = (2x-3)
4y - 5xy = 2x - 3
4y + 3 = 2x + 5xy
4y + 3 = x (2+5y)
x = (4y + 3) / (2+5y)
fungsi invers :
f-1(x) = (4x + 3) / (5x+2)
y = (2x-3) / (4-5x)
y (4-5x) = (2x-3)
4y + 3 = 2x + 5xy
4y + 3 = x (2+5y)
x = (4y + 3) / (2+5y)
fungsi invers :
f-1(x) = (4x + 3) / (5x+2)
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