Diketahui f(x)=1/2 (x-2) g(x)=3x+5 Ditanya: a) fog (-4) b) gofog (x)

a) fog (-4) = f(g(-4))
= f(3.(-4) + 5)
= f(-12+5)
= f(-7)
= 1/2 (-7-2)
= 1/2 x (-9)
= -9/2

b) gofog (x) = g(f(g(x)))
= g(f(3x+5))
= g(1/2(3x+5-2))
= g(1/2(3x+3))
= 3(1/2(3x+3))+5
[tex] = \frac{(9x + 9)}{2} + 5[/tex]
[tex] = \: \frac{9x + 19}{2} [/tex]

Semoga membantu :)