Y=-3x2+30x-75

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Solution for Y=-3x2+30x-75 equation: 



=-3Y^2+30Y-75

We move all terms to the left:

-(-3Y^2+30Y-75)=0

We get rid of parentheses

3Y^2-30Y+75=0

a = 3; b = -30; c = +75;
Δ = b2-4ac
Δ = -302-4·3·75
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$Y=\frac{-b}{2a}=\frac{30}{6}=5$

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