Question

sabendo que f(x+1)=2,calcule f(6)

Answer 1

x+1 = 2 
x = 2-1
x = 1
F(x) = 1.x + 1
F(6) = 1.6 + 1 = 6+1 = 7

Answer 2

f(x + 1) = 2

Fazendo:

x + 1 = 6 => x = 6-1 => x = 5

f(5+1) = 2

f(6) = 2