Question Number 160341 by mathlove last updated on 28/Nov/21
$${f}\left({f}\left({x}\right)\right)=\mathrm{10}{x}^{\mathrm{2}} −{f}\left({x}\right)\:\:\:\:\:\:{faind}\:\:\:{f}\left({x}\right) \\ $$
Commented by mathlove last updated on 28/Nov/21
$${help}\:{me}\:\:{pleas} \\ $$
Commented by mathmax by abdo last updated on 28/Nov/21
$$\mathrm{i}\:\mathrm{think}\:\mathrm{this}\:\mathrm{problem}\:\mathrm{is}\:\mathrm{not}\:\mathrm{resoluble}...! \\ $$
Commented by Rasheed.Sindhi last updated on 29/Nov/21
$${I}\:{think}\:{so}. \\ $$