25=30y-9y^2

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Solution for 25=30y-9y^2 equation: 



25=30y-9y^2

We move all terms to the left:

25-(30y-9y^2)=0

We get rid of parentheses

9y^2-30y+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:
$y=\frac{-b}{2a}=\frac{30}{18}=1+2/3$

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