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9n^2-36n=0
a = 9; b = -36; c = 0;
Δ = b2-4ac
Δ = -362-4·9·0
Δ = 1296
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{1296}=36$$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-36)-36}{2*9}=\frac{0}{18} =0 $$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-36)+36}{2*9}=\frac{72}{18} =4 $
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