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^3+4D^2-25D-100=0
We add all the numbers together, and all the variables
4D^2-25D=0
a = 4; b = -25; c = 0;
Δ = b2-4ac
Δ = -252-4·4·0
Δ = 625
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$D_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$D_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{625}=25$$D_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-25)-25}{2*4}=\frac{0}{8} =0 $$D_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-25)+25}{2*4}=\frac{50}{8} =6+1/4 $
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