F(x) : 3- x² g(x) : 2x-1

(fog)(x) = f (g(x))
=f(2x-1)
f(x) = 3-x²
=3-(2x-1)²
=3-2x²+4x-1
(fog)(x) =2x²+4x+2

(gof)(x) = g(f(x))
=g (3-x²)
g(x)= 2x-1
=2(3-x²)-1
=6-2x²-1
(gof)(x) =2x²+5