Question 146673
{{{sqrt(x)+20-x=0}}}
You might mean {{{sqrt(x+20)-x=0}}}
I'll do this one:
{{{sqrt(x)+20-x=0}}}
{{{sqrt(x)= x-20}}}
Square both sides
{{{x = x^2 -40x + 400}}}
Put in quadratic form
{{{x^2 -41x + 400 = 0}}}
*[invoke solve_quadratic_equation 1,-41,400]