Diketahui f(×)=2×+1 dan g(×)=5×-4 tentukan n. a.(f°g)(×) dan (g°f)(x) . b.(f°g)(5) dan (g°f)(5)

caranya di gambar

maaf kalau salah

f(x) = 2x + 1
g(x) = 5x - 4

A).
fog(x) = f(g(x)
fog(x) = f(5x - 4)
fog(x) = 2(5x - 4) + 1
fog(x) = 10x - 8 + 1
fog(x) = 10x - 7

gof(x) = g(f(x)
gof(x) = g(2x + 1)
gof(x) = 5(2x + 1) - 4
gof(x) = 10x + 5 - 4
gof(x) = 10x + 1

B).
fog(x) = 10x - 7
fog(5) = 10(5) - 7
fog(5) = 50 - 7
fog(5) = 43

gof(x) = 10x + 1
gof(5) = 10(5) + 1
gof(5) = 50 + 1
gof(5) = 51