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x^2+85.2x-579.36=0
a = 1; b = 85.2; c = -579.36;
Δ = b2-4ac
Δ = 85.22-4·1·(-579.36)
Δ = 9576.48
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{-(85.2)-\sqrt{9576.48}}{2*1}=\frac{-85.2-\sqrt{9576.48}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(85.2)+\sqrt{9576.48}}{2*1}=\frac{-85.2+\sqrt{9576.48}}{2} $
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