Question

Tolong dibantu ya nomor 24 dan 26 ...
Pake cara ...
Jangan asal yang asal aku report
Mohon bantuannya ^^

Answer 1

24. f(x) = (1-x)/x ,  g o f (x) = 2x+1 => subtitusi f(x) = m

g(m) = 2x + 1

g((1-x)/x) = 2x+1

m = 1-x/x

mx = 1-x

mx+x = 1

x(m+1) = 1

x = 1/(m+1)

g(x) = g(1/(m+1))

g(1/(m+1)) = 2(1/(m+1)) + 1

               = 2/(m+1)) + 1

g(x) = 2/(x+1) + 1 <= subtitusi g(x) = y

y  = 2/(x+1)  + 1

y - 1 = 2/(x+1)

(x+1)(y-1) = 2

xy - x + y - 1 = 2

xy - x = 3 - y

x(y-1) = -(y-3)

x = - (y-3)/(y-1)

(D)

26. f(x) = 3x-1 , g(x) = 2x²+3 . g o f (1) = ?

g o f (1) = g(f(1)) <= cari dulu nilai f(1)

f(1) = 3.1 - 1

f(1) = 2

g(f(1)) = g(2)

g(2) = 2.2²+3

      = 8 + 3 = 11 (C)