2x^2+10x-820=0

Solution for 2x^2+10x-820=0 equation:

2x^2+10x-820=0

a = 2; b = 10; c = -820;
Δ = b2-4ac
Δ = 102-4·2·(-820)
Δ = 6660
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:

$\sqrt{\Delta}=\sqrt{6660}=\sqrt{36*185}=\sqrt{36}*\sqrt{185}=6\sqrt{185}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(10)-6\sqrt{185}}{2*2}=\frac{-10-6\sqrt{185}}{4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(10)+6\sqrt{185}}{2*2}=\frac{-10+6\sqrt{185}}{4}
$