dik f(x)=2x +5 dan g(x)= x-1/x+4.jika (fog) (a) =5,maka tentuka a

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

(f ○ g)(x)= 2(x-1/x+4) + 5
= [2x-2/x-4] +5
(f ○ g)(a)= 5
= [2a-2/a-4] +5= 5
= [2a-2/a-4] =0
= a= 1

Kelas 10 Matematika
Bab Fungsi Komposisi

(fog) (a) = 5
f((a - 1)/(a + 4)) = 5
2 (a - 1)/(a + 4) + 5 = 5
2 (a - 1)/(a + 4) = 5 - 5
2 (a - 1) = 0
a - 1 = 0
a = 1