bantu saya tolong kak

jawab

f(x)= x-5
g(x)= x^2 - 1
fog(x)= 3
f(g(x)} =  3
f(x^2 -1) = 3
 x^2 - x - 5 = 3
x^2 - x - 2 = 0
(x  +1)(x - 2)=0
x = -1  atau x = 2

b. gof(x) = 0
g{ f(x) } = 0
g(x-5)= 0
(x-5)^2 - 1= 0
(x - 5)^2 = 1
x- 5 = 1  atau x - 5 = -1
x= 6  atau  x = -4