Jawabanmu

2014-07-15T15:34:21+07:00
Gunakan konsep dasar:
f(a) = b <=>  f^-1(b) = a
Anggap:
u = x - 1 maka x = u + 1
f^-1(u) =  \frac{4 - 3(u + 1)}{(u + 1) - 2}
<> f^-1(u) = \frac{1 - 3u}{u - 1}
<> f^-1(x) = \frac{1 - 3x}{x - 1}
diperoleh
 \frac{1 - 3x}{x - 1} = -5
<> 1 - 3x = -5x + 5
<> 2x = 4
<> x = 4
jadi, nilai f(-5) = 2