Misal: a =2x+1
a-1= 2x
x= a-1/2
(fog)(x)= f(g(x))
x²+x=f(2x+1)
(a-1/2)²+a-1/2=f(a) (subtitusi)
(a²-1/4) + a-1/2= f(a)
2a²-2+4a-2/8
a²-1+2a-1/4
f(x)= x²-1+2x-1/4
Maaf kalau salah
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Misal: a =2x+1
a-1= 2x
x= a-1/2
(fog)(x)= f(g(x))
x²+x=f(2x+1)
(a-1/2)²+a-1/2=f(a) (subtitusi)
(a²-1/4) + a-1/2= f(a)
2a²-2+4a-2/8
a²-1+2a-1/4
f(x)= x²-1+2x-1/4
Maaf kalau salah