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90r^2-30r=0
a = 90; b = -30; c = 0;
Δ = b2-4ac
Δ = -302-4·90·0
Δ = 900
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{900}=30$$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-30)-30}{2*90}=\frac{0}{180} =0 $$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-30)+30}{2*90}=\frac{60}{180} =1/3 $
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