jika f(x)= (2x+1/3x-5) dan g(x)= (2x-5). Tentukan (gof)(-1)

gof (x) = [2(2x+1/3x-5)-5]
= 4x+2/3x-10-5
= 4x+2/3x-15
gof (-1)= 4(-1)+2/3(-1)-15
= -4-2/3-15
= -19 2/3
kalau tidak salah seperti itu

Bab Fungsi Komposisi
Matematika SMA Kelas X

(gof) (x) = g ((2x + 1) / (3x - 5))
(gof) (x) = 2 ((2x + 1) / (3x - 5)) - 5
(gof) (-1) = 2 ((2 . (-1) + 1) / (3 . (-1) - 5)) - 5
(gof) (-1) = 2 (-1 / -8) - 5
(gof) (-1) = 1/4 - 5
(gof) (-1) = -19/4 = -4 3/4