Question Number 12885 by FilupS last updated on 05/May/17
$${f}\left({f}\left({x}\right)\right)={f}^{\mathrm{2}} \left({x}\right) \\ $$$$\: \\ $$$$\mathrm{What}\:\mathrm{is}\:\mathrm{a}\:\mathrm{solution}? \\ $$
Answered by mrW1 last updated on 05/May/17
$${u}={f}\left({x}\right) \\ $$$$\Rightarrow{f}\left({u}\right)={u}^{\mathrm{2}} \\ $$$$\Rightarrow{f}\left({x}\right)={x}^{\mathrm{2}} \\ $$