4s2-9s-5=0

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Solution for 4s2-9s-5=0 equation: 



4s^2-9s-5=0

a = 4; b = -9; c = -5;
Δ = b2-4ac
Δ = -92-4·4·(-5)
Δ = 161
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$s_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$s_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$s_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-9)-\sqrt{161}}{2*4}=\frac{9-\sqrt{161}}{8}
$


$s_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-9)+\sqrt{161}}{2*4}=\frac{9+\sqrt{161}}{8}
$

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