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5x^2-9x-3=0
a = 5; b = -9; c = -3;
Δ = b2-4ac
Δ = -92-4·5·(-3)
Δ = 141
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{141}}{2*5}=\frac{9-\sqrt{141}}{10} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-9)+\sqrt{141}}{2*5}=\frac{9+\sqrt{141}}{10} $
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