9b2+30b+25=0.

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Solution for 9b2+30b+25=0. equation: 



9b^2+30b+25=0.

a = 9; b = 30; c = +25;
Δ = b2-4ac
Δ = 302-4·9·25
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$b=\frac{-b}{2a}=\frac{-30}{18}=-1+2/3$

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