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81-9u^2=0
a = -9; b = 0; c = +81;
Δ = b2-4ac
Δ = 02-4·(-9)·81
Δ = 2916
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$u_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$u_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{2916}=54$$u_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-54}{2*-9}=\frac{-54}{-18} =+3 $$u_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+54}{2*-9}=\frac{54}{-18} =-3 $
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