3(x+6)(x+2)=-12

Solution for 3(x+6)(x+2)=-12 equation:

3(x+6)(x+2)=-12

We move all terms to the left:

3(x+6)(x+2)-(-12)=0

We add all the numbers together, and all the variables

3(x+6)(x+2)+12=0

We multiply parentheses ..

3(+x^2+2x+6x+12)+12=0

We multiply parentheses

3x^2+6x+18x+36+12=0

We add all the numbers together, and all the variables

3x^2+24x+48=0

a = 3; b = 24; c = +48;
Δ = b2-4ac
Δ = 242-4·3·48
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{-24}{6}=-4$