Diketahui f(x)=x+4 dan g(x)=-3X TENTUKAN a. (f ° g)(x) b. (f ° g)(2) c. (g ° f)(x) d. ( g°f)(-1)!

a. fog (x) = f(g(x))
= f(-3x)
= (-3x)+4
= -3x+4

b. fog (5) = -3(5)+4
= -15+4
= -11

c. gof (x) = g(f(x))
= g(x+4)
= -3(x+4)
= -3x-12

d. gof (x) = h(x) = y
y = -3x-12
3x = y+12
x = y+12/3
gof (x)-¹ = x+12/3

a)(fog)(x)=f(gx)
                = x+4
                = -3x+4

b)(fog)(2)=-3x+4
               =  -3(2)+4
              =-6+4
              =-2
c)(gof)(x)=g(fx)
               =-3x
               =-3(x)+4
                =-3x+4
d)(gof)(-1)=-3x+4
                =-3(-1)+4
                =3+4
                =7