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6m^2-9m-20=0
a = 6; b = -9; c = -20;
Δ = b2-4ac
Δ = -92-4·6·(-20)
Δ = 561
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$m_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$m_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$m_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-9)-\sqrt{561}}{2*6}=\frac{9-\sqrt{561}}{12} $$m_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-9)+\sqrt{561}}{2*6}=\frac{9+\sqrt{561}}{12} $
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