Tolong jawab ya besok di kumpul,beserta penyelasaiannya ya

Jawab

19. g(x)= x+ 5
fog(x)= 6x + 3
f { g(x) } = 6x + 3
f (x+ 5) = 6x + 3
f (x) = 6(x – 5) + 3
f(x) = 6x – 27

20. g(x)= 3 – 2x
gof(x)= 2x² + 2x  – 11
g {f(x)}= 2x² + 2x – 11
3 – 2 f(x)=  2x² + 2x – 11
– 2 f(x) = 2x² + 2x -11- 3
– 2  f(x) = 2x² + 2x -14
f(x)=  -x² – x – 7