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x^2-19x-400=0
a = 1; b = -19; c = -400;
Δ = b2-4ac
Δ = -192-4·1·(-400)
Δ = 1961
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{-(-19)-\sqrt{1961}}{2*1}=\frac{19-\sqrt{1961}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-19)+\sqrt{1961}}{2*1}=\frac{19+\sqrt{1961}}{2} $
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