(2x+6)(-x-3)=0

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Solution for (2x+6)(-x-3)=0 equation: 



(2x+6)(-x-3)=0

We add all the numbers together, and all the variables

(2x+6)(-1x-3)=0

We multiply parentheses ..

(-2x^2-6x-6x-18)=0

We get rid of parentheses

-2x^2-6x-6x-18=0

We add all the numbers together, and all the variables

-2x^2-12x-18=0

a = -2; b = -12; c = -18;
Δ = b2-4ac
Δ = -122-4·(-2)·(-18)
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{12}{-4}=-3$

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