2x2-9x-4=0

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Solution for 2x2-9x-4=0 equation: 



2x^2-9x-4=0

a = 2; b = -9; c = -4;
Δ = b2-4ac
Δ = -92-4·2·(-4)
Δ = 113
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-9)-\sqrt{113}}{2*2}=\frac{9-\sqrt{113}}{4}
$


$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-9)+\sqrt{113}}{2*2}=\frac{9+\sqrt{113}}{4}
$

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