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d2+30d=0
We add all the numbers together, and all the variables
d^2+30d=0
a = 1; b = 30; c = 0;
Δ = b2-4ac
Δ = 302-4·1·0
Δ = 900
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{900}=30$$d_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(30)-30}{2*1}=\frac{-60}{2} =-30 $$d_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(30)+30}{2*1}=\frac{0}{2} =0 $
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