Question

Sim f(x+1)= x +5, calcule f(x-1) em função de x

Answer 1

$\mathsf{f(x+1)=x+5}\\\mathsf{x=f(x+1)-5}\\\mathsf{x-2=f(x+1-2)-5}\\\mathsf{x-2=f(x-1)-5}\\\mathsf{f(x-1)=x-2+5}\\\mathsf{f(x-1)=x+3}$