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72y^2+45y=0
a = 72; b = 45; c = 0;
Δ = b2-4ac
Δ = 452-4·72·0
Δ = 2025
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}$$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{2025}=45$$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(45)-45}{2*72}=\frac{-90}{144} =-5/8 $$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(45)+45}{2*72}=\frac{0}{144} =0 $
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