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8n^2-800=0
a = 8; b = 0; c = -800;
Δ = b2-4ac
Δ = 02-4·8·(-800)
Δ = 25600
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{25600}=160$$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-160}{2*8}=\frac{-160}{16} =-10 $$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+160}{2*8}=\frac{160}{16} =10 $
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