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-3x^2+5x+5.5=0
a = -3; b = 5; c = +5.5;
Δ = b2-4ac
Δ = 52-4·(-3)·5.5
Δ = 91
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{91}}{2*-3}=\frac{-5-\sqrt{91}}{-6} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+\sqrt{91}}{2*-3}=\frac{-5+\sqrt{91}}{-6} $
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