Question

Jika diketahui f(x) = 1 - 3x dan g(x) = x - 2f(x) maka harga f(g(1)) adalah

Answer 1

F (x) = 1 - 3x
g (x) = x - 2f(x)

2f(x) = 2(1 - 3x)
= 2 - 6x

g (x) = x - (2 - 6x)
= 5x - 2

==========

f (x) = 1 - 3x
g (x) = 5x - 2

f(g(x)) = 1 - 3(5x - 2)
= 1 - 15x + 6
= 7 - 15x

f(g(1)) = 7 - 15(1)
= 7 - 15
= -8