Question

as funções f e g, tal que f(x) =x+7 e g(x)=x-9

Answer 1

f(x)= x+7
x+7=0
x= -7

g(x)= x-9
x-9=0
x= 9

Answer 2

Boa tarde Gabrielle

f(x) = x + 7
g(x) = x - 9

f(g(x)) = g(x) + 7 = x - 9 + 7 = x - 2

g(f(x)) = f(x) - 9 = x + 7 - 9 = x - 2