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25-81v^2=0
a = -81; b = 0; c = +25;
Δ = b2-4ac
Δ = 02-4·(-81)·25
Δ = 8100
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$v_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$v_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{8100}=90$$v_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-90}{2*-81}=\frac{-90}{-162} =5/9 $$v_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+90}{2*-81}=\frac{90}{-162} =-5/9 $
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