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n^2-17n-860=0
a = 1; b = -17; c = -860;
Δ = b2-4ac
Δ = -172-4·1·(-860)
Δ = 3729
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-17)-\sqrt{3729}}{2*1}=\frac{17-\sqrt{3729}}{2} $$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-17)+\sqrt{3729}}{2*1}=\frac{17+\sqrt{3729}}{2} $
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