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5.4y^2-10.8y=0
a = 5.4; b = -10.8; c = 0;
Δ = b2-4ac
Δ = -10.82-4·5.4·0
Δ = 116.64
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-10.8)-\sqrt{116.64}}{2*5.4}=\frac{10.8-\sqrt{116.64}}{10.8} $$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-10.8)+\sqrt{116.64}}{2*5.4}=\frac{10.8+\sqrt{116.64}}{10.8} $
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