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2+81x-3x^2=0
a = -3; b = 81; c = +2;
Δ = b2-4ac
Δ = 812-4·(-3)·2
Δ = 6585
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{-(81)-\sqrt{6585}}{2*-3}=\frac{-81-\sqrt{6585}}{-6} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(81)+\sqrt{6585}}{2*-3}=\frac{-81+\sqrt{6585}}{-6} $
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