Jika g(x)=3x+1 dan g(f(x)) =5xkuadrat+x-3maka f(x) Tolong dijawab kakak please inj lagi butuh banget

fog(x) = gof(x)
fg(x) = gf(x)
f(3x+1) = 5x^2 + x - 3
misal : t = 3x+ 1
t - 1 = 3x
t - 1 /3 = x
f(x) = 5x^2 + x - 3
= 5(t-1/3)^2 + (t-1/3) + 3
di lanjut sendiri aja ya:)