0=-3x^2-30x-75

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Solution for 0=-3x^2-30x-75 equation: 



0=-3x^2-30x-75

We move all terms to the left:

0-(-3x^2-30x-75)=0

We add all the numbers together, and all the variables

-(-3x^2-30x-75)=0

We get rid of parentheses

3x^2+30x+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:
$x=\frac{-b}{2a}=\frac{-30}{6}=-5$

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