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81b^2-25b=0
a = 81; b = -25; c = 0;
Δ = b2-4ac
Δ = -252-4·81·0
Δ = 625
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{625}=25$$b_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-25)-25}{2*81}=\frac{0}{162} =0 $$b_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-25)+25}{2*81}=\frac{50}{162} =25/81 $
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