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-0.4985x^2+70.787x+2.2=0
a = -0.4985; b = 70.787; c = +2.2;
Δ = b2-4ac
Δ = 70.7872-4·(-0.4985)·2.2
Δ = 5015.186169
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{-(70.787)-\sqrt{5015.186169}}{2*-0.4985}=\frac{-70.787-\sqrt{5015.186169}}{-0.997} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(70.787)+\sqrt{5015.186169}}{2*-0.4985}=\frac{-70.787+\sqrt{5015.186169}}{-0.997} $
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