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3x^2+11x-9=0
a = 3; b = 11; c = -9;
Δ = b2-4ac
Δ = 112-4·3·(-9)
Δ = 229
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{229}}{2*3}=\frac{-11-\sqrt{229}}{6} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(11)+\sqrt{229}}{2*3}=\frac{-11+\sqrt{229}}{6} $
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