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8b^2-40b=0
a = 8; b = -40; c = 0;
Δ = b2-4ac
Δ = -402-4·8·0
Δ = 1600
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$b_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$b_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{1600}=40$$b_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-40)-40}{2*8}=\frac{0}{16} =0 $$b_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-40)+40}{2*8}=\frac{80}{16} =5 $
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