2y^2+9y-20=0

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Solution for 2y^2+9y-20=0 equation: 



2y^2+9y-20=0

a = 2; b = 9; c = -20;
Δ = b2-4ac
Δ = 92-4·2·(-20)
Δ = 241
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(9)-\sqrt{241}}{2*2}=\frac{-9-\sqrt{241}}{4}
$


$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(9)+\sqrt{241}}{2*2}=\frac{-9+\sqrt{241}}{4}
$

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