2y^2+12y-220=0

Solution for 2y^2+12y-220=0 equation:

2y^2+12y-220=0

a = 2; b = 12; c = -220;
Δ = b2-4ac
Δ = 122-4·2·(-220)
Δ = 1904
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{1904}=\sqrt{16*119}=\sqrt{16}*\sqrt{119}=4\sqrt{119}$
$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(12)-4\sqrt{119}}{2*2}=\frac{-12-4\sqrt{119}}{4}
$
$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(12)+4\sqrt{119}}{2*2}=\frac{-12+4\sqrt{119}}{4}
$