Question

Diketahui :
g(x) = x - 2
(f⚪g) (x) = 2x + 1

Tentukan f(x) !

Answer 1

(f⚪g) (x) = f(g(x))

2x+1 = f (x-2)

Misal x -2 = a maka x = a+2

2(a+2) +1 = f(a)

2a +4 +1 = f(a)

2a +5 =f(a)

2x + 5 = f(x)