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x^2-80x+1.5=0
a = 1; b = -80; c = +1.5;
Δ = b2-4ac
Δ = -802-4·1·1.5
Δ = 6394
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{-(-80)-\sqrt{6394}}{2*1}=\frac{80-\sqrt{6394}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-80)+\sqrt{6394}}{2*1}=\frac{80+\sqrt{6394}}{2} $
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