9x^2-11x-11=0

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Solution for 9x^2-11x-11=0 equation: 



9x^2-11x-11=0

a = 9; b = -11; c = -11;
Δ = b2-4ac
Δ = -112-4·9·(-11)
Δ = 517
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{-(-11)-\sqrt{517}}{2*9}=\frac{11-\sqrt{517}}{18}
$


$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-11)+\sqrt{517}}{2*9}=\frac{11+\sqrt{517}}{18}
$

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