Question

Fungsi, Komposisi Fungsi, dan Fungsi Invers
diketahui f(x) = 5-3x, dan g(x) = 9x+1/x-1, x≠1. nilai f(x) ×g(2/3) = ....
a. -105+63x
b. -105-63x
c. 105-63x
d. -35+3x
e. 35-3x

Answer 1

Fungsi Komposisi

f(x)=5-3x
=-3x+5
g(x)=(9x+1)/(x-1)

f(x)xg(x)=(-3x+5).(9(2/3)+1)/(2/3-1)
=(-3x+5).(6+1)/(2/3-3/3)
=(-3x+5)(7)/(-1/3)
=(-21x+35)x(-3/1)
=(-21x+35)(-3)
=(63x-105)
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Pilihan A.

Demikian Semoga Membantu dan Bermanfaat!