x2+2x=51250

Solution for x2+2x=51250 equation:

x2+2x=51250

We move all terms to the left:

x2+2x-(51250)=0

We add all the numbers together, and all the variables

x^2+2x-51250=0

a = 1; b = 2; c = -51250;
Δ = b2-4ac
Δ = 22-4·1·(-51250)
Δ = 205004
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{205004}=\sqrt{4*51251}=\sqrt{4}*\sqrt{51251}=2\sqrt{51251}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(2)-2\sqrt{51251}}{2*1}=\frac{-2-2\sqrt{51251}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2)+2\sqrt{51251}}{2*1}=\frac{-2+2\sqrt{51251}}{2}
$