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20r^2-45r=0
a = 20; b = -45; c = 0;
Δ = b2-4ac
Δ = -452-4·20·0
Δ = 2025
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{2025}=45$$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-45)-45}{2*20}=\frac{0}{40} =0 $$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-45)+45}{2*20}=\frac{90}{40} =2+1/4 $
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