Question 470082
{{{ x + sqrt(x) - 20 = 0 }}}
{{{ sqrt(x) =20-x }}}
{{{ (sqrt(x))^2 =(20-x)^2 }}}
{{{ x =400-40x+x^2 }}}
{{{ 0=400-41x+x^2 }}}
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
{{{x = (41 +- sqrt( 1681-1600 ))/(2) }}} 
{{{x = (41 +- sqrt( 81 ))/(2) }}} 
{{{x = (41 +- 9)/(2) }}} 
{{{x = (41 + 9)/(2) }}} 
{{{x = 50/2 }}} 
{{{x = 25 }}} 

or
{{{x = (41 - 9)/(2) }}} 
{{{x = 32/2 }}}
{{{x = 16 }}}