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18.1x-9x^2=0
a = -9; b = 18.1; c = 0;
Δ = b2-4ac
Δ = 18.12-4·(-9)·0
Δ = 327.61
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{-(18.1)-\sqrt{327.61}}{2*-9}=\frac{-18.1-\sqrt{327.61}}{-18} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(18.1)+\sqrt{327.61}}{2*-9}=\frac{-18.1+\sqrt{327.61}}{-18} $
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