Question

Using the quadratic formula to solve x2 + 20 = 2x, what are the values of x?

Answer 1

$x^2+20=2x \\x^2-2x+20=0 \\x=\frac{2+\vee-\sqrt{-76}}{2}\Longrightarrow\boxed{x\notin\mathbb{R}}$