Question

If f(x)= x/x_1 ,then f(a)/f(a_1) is equal to

Answer 1

If f(x)=x/(x-1), f(a)=a/(a-1); f(a+1)=(a+1)/a

And f(a)f(a+1)=a2(a−1)(a+1)=a2a2–1=f(a2)