4*x^2+9*x-1=0

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Solution for 4*x^2+9*x-1=0 equation: 



4x^2+9x-1=0

a = 4; b = 9; c = -1;
Δ = b2-4ac
Δ = 92-4·4·(-1)
Δ = 97
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{97}}{2*4}=\frac{-9-\sqrt{97}}{8}
$


$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(9)+\sqrt{97}}{2*4}=\frac{-9+\sqrt{97}}{8}
$

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