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4s^2-18s=0
a = 4; b = -18; c = 0;
Δ = b2-4ac
Δ = -182-4·4·0
Δ = 324
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$s_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$s_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{324}=18$$s_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-18)-18}{2*4}=\frac{0}{8} =0 $$s_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-18)+18}{2*4}=\frac{36}{8} =4+1/2 $
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