X^2+2x-625=0

Solution for X^2+2x-625=0 equation:

X^2+2X-625=0

a = 1; b = 2; c = -625;
Δ = b2-4ac
Δ = 22-4·1·(-625)
Δ = 2504
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:

$\sqrt{\Delta}=\sqrt{2504}=\sqrt{4*626}=\sqrt{4}*\sqrt{626}=2\sqrt{626}$
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(2)-2\sqrt{626}}{2*1}=\frac{-2-2\sqrt{626}}{2}
$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2)+2\sqrt{626}}{2*1}=\frac{-2+2\sqrt{626}}{2}
$