5) f(x)=2x²+1 g(x)=2x+4 Find (f-g)(x)
6) g(x)=3x+3 h(x)=4x+5 Find (g-h)(x)
7) h(x)=-3x²-5 g(x)=x+4 Find (h· g)(x)
8) g(x) = x+4 f(x) = x² + 3x Find (g. f)(x)​