4+12d=-9d^2

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Solution for 4+12d=-9d^2 equation: 



4+12d=-9d^2

We move all terms to the left:

4+12d-(-9d^2)=0

We get rid of parentheses

9d^2+12d+4=0

a = 9; b = 12; c = +4;
Δ = b2-4ac
Δ = 122-4·9·4
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$d=\frac{-b}{2a}=\frac{-12}{18}=-2/3$

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