Question Number 29508 by abdo imad last updated on 09/Feb/18
$${x}\:{and}\:{y}\:{are}\:{elements}\:{from}\:{R}\:{wich}\:{verify} \\ $$$$\left({x}+\sqrt{{x}^{\mathrm{2}} +\mathrm{1}}\right)\left({y}\:+\sqrt{{y}^{\mathrm{2}} +\mathrm{1}}\right)=\:\mathrm{1}\:\:{find}\:{x}+{y}\:. \\ $$