6x2-20x-80=0

Solution for 6x2-20x-80=0 equation:

6x^2-20x-80=0

a = 6; b = -20; c = -80;
Δ = b2-4ac
Δ = -202-4·6·(-80)
Δ = 2320
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:

$\sqrt{\Delta}=\sqrt{2320}=\sqrt{16*145}=\sqrt{16}*\sqrt{145}=4\sqrt{145}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-20)-4\sqrt{145}}{2*6}=\frac{20-4\sqrt{145}}{12}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-20)+4\sqrt{145}}{2*6}=\frac{20+4\sqrt{145}}{12}
$