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66n^2+42n=0
a = 66; b = 42; c = 0;
Δ = b2-4ac
Δ = 422-4·66·0
Δ = 1764
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{1764}=42$$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(42)-42}{2*66}=\frac{-84}{132} =-7/11 $$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(42)+42}{2*66}=\frac{0}{132} =0 $
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