9d^2-9d=0

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Solution for 9d^2-9d=0 equation: 



9d^2-9d=0

a = 9; b = -9; c = 0;
Δ = b2-4ac
Δ = -92-4·9·0
Δ = 81
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$d_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$d_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{81}=9$


$d_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-9)-9}{2*9}=\frac{0}{18}
=0
$


$d_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-9)+9}{2*9}=\frac{18}{18}
=1
$

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