Solve for x:
\(x = \sqrt{x^2 + \sqrt{2020-\sqrt{x^2 + \sqrt{2020 - \sqrt{x^2 + 2020 - \sqrt{\cdots}}}}}}\)
Subbing the expression for x into the radical, we have that
x = √[ x^2 + √[2020 - x ] ] square both sides
x^2 = x^2 + √[2020 - x ]
0 = √[ [2020 - x ]
x = 2020
