Question Number 7820 by ridwan balatif last updated on 17/Sep/16
$${if}\:\mathrm{2}{x}+\mathrm{1}=\sqrt{\mathrm{111}},\:\mathrm{2}{x}^{\mathrm{5}} +\mathrm{2}{x}^{\mathrm{4}} −\mathrm{53}{x}^{\mathrm{3}} −\mathrm{57}{x}+\mathrm{54}=…? \\ $$
if-2x-1-111-2x-5-2x-4-53x-3-57x-54-