9x2-5x-1=0

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Solution for 9x2-5x-1=0 equation: 



9x^2-5x-1=0

a = 9; b = -5; c = -1;
Δ = b2-4ac
Δ = -52-4·9·(-1)
Δ = 61
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{-(-5)-\sqrt{61}}{2*9}=\frac{5-\sqrt{61}}{18}
$


$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-5)+\sqrt{61}}{2*9}=\frac{5+\sqrt{61}}{18}
$

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