5x^2-10x-118=0

Solution for 5x^2-10x-118=0 equation:

5x^2-10x-118=0

a = 5; b = -10; c = -118;
Δ = b2-4ac
Δ = -102-4·5·(-118)
Δ = 2460
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:

$\sqrt{\Delta}=\sqrt{2460}=\sqrt{4*615}=\sqrt{4}*\sqrt{615}=2\sqrt{615}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-10)-2\sqrt{615}}{2*5}=\frac{10-2\sqrt{615}}{10}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-10)+2\sqrt{615}}{2*5}=\frac{10+2\sqrt{615}}{10}
$