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3x^2+13x-26=0
a = 3; b = 13; c = -26;
Δ = b2-4ac
Δ = 132-4·3·(-26)
Δ = 481
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{-(13)-\sqrt{481}}{2*3}=\frac{-13-\sqrt{481}}{6} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(13)+\sqrt{481}}{2*3}=\frac{-13+\sqrt{481}}{6} $
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