9y^2=-25+30y

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



9y^2=-25+30y

We move all terms to the left:

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

We add all the numbers together, and all the variables

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