Find f-g, gf, and gg. f(x)=x², g(x)=x-4 (a) F-g (b) gof (c) 9.9 MY NOTES PRACTICE A 6. [-/3 Points] DETAILS Find f-g, gf, and gg. f(x)=√√x-4, g(x) = x² + 4 (a) F-g (b) gof (c) 9.9