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n*n-3n-878=0
We add all the numbers together, and all the variables
-3n+n*n-878=0
Wy multiply elements
n^2-3n-878=0
a = 1; b = -3; c = -878;
Δ = b2-4ac
Δ = -32-4·1·(-878)
Δ = 3521
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{-(-3)-\sqrt{3521}}{2*1}=\frac{3-\sqrt{3521}}{2} $$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-3)+\sqrt{3521}}{2*1}=\frac{3+\sqrt{3521}}{2} $
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