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2n^2-76n+720=0
a = 2; b = -76; c = +720;
Δ = b2-4ac
Δ = -762-4·2·720
Δ = 16
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}$$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{16}=4$$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-76)-4}{2*2}=\frac{72}{4} =18 $$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-76)+4}{2*2}=\frac{80}{4} =20 $
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