Question

Pomogite. druzya please

Answer 1

$f(x)=\frac{ax+b}{cx+d}, \\ x=\frac{af^{-1}(x)+b}{cf^{-1}(x)+d}, \\ x(cf^{-1}(x)+d)=af^{-1}(x)+b, \\ cxf^{-1}(x)+dx=af^{-1}(x)+b, \\ cxf^{-1}(x)-af^{-1}(x)=b-dx, \\ f^{-1}(x)(cx-a)=-dx+b, \\ f^{-1}(x)=\frac{-dx+b}{cx-a}.$