Sum of Roots

To satisfy my own interests, $(x-1)^2 = 5(10^{14})$ , or simply $x = 1\pm10^7\sqrt{5}$ , whose sum is 2.

By Vieta's formula .

Sum of roots = $\dfrac{-b}{a}$
$\therefore \dfrac{4}{2}=\boxed{2}$

By Vieta, the sum of the roots is $-\frac{b}{a}$ , so the answer is $-\frac{-4}{2} = 2$

In a quadratic equation, $ax^2+bx+c=0$ , the sum of the roots is $\dfrac{-b}{a}$ . Substitute:

$x_1+x_2=\dfrac{-(-4)}{2}=\boxed{2}$