Question

 f and f^-1 are functions. If f(x)=x+2, then f^-1 (x+2)=?

Answer 1

$\mathtt{f^-1(x+2)=?}\\\mathtt{f(?)=x+2}\\\mathtt{but\:f(x)=x+2\:because\:at\:the\:question.}\\\mathtt{so\:?=x}$