Question 697143
Given {{{sqrt(X+2) = X}}}
I would start by squaring both sides of teh equation to remove the radical sign.
{{{X + 2 = X^2}}}
Now subtract X from both sides
{{{2 = X^2 - X}}}
Subtract 2 from both sides
{{{0 = X^2 - X - 2}}}
Now you can use the quadratic equation.
*[invoke quadratic "X", 1, -1, -2]