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6u^2+5u-25=0
a = 6; b = 5; c = -25;
Δ = b2-4ac
Δ = 52-4·6·(-25)
Δ = 625
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$u_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$u_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{625}=25$$u_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(5)-25}{2*6}=\frac{-30}{12} =-2+1/2 $$u_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+25}{2*6}=\frac{20}{12} =1+2/3 $
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