Question

If f(1/x) = 2x, what is f(x)?
(a) 2/x
(b) x/2
(c) 1/2x
(d) 2
(e) cannot be determined

Answer 1

f(1/x) = 2x
then we have
f(x) = 2/x

Lets test it
if you plug 1/x into f(x) = 2/(1/x) you get
f(1/x) = 2/(1/x)
= (2/1)(x/1) = 2x

Answer 2

just use logic to solve these problems

Answer 3

problem solved

Answer 4

Lets test

it if you plug 1/x into f(x) = 2/x

you get f(1/x) = 2/(1/x) = (2/1)(x/1) = 2x

Answer 5

thank you :)