2x(x+3)=-4x-12

Solution for 2x(x+3)=-4x-12 equation:

2x(x+3)=-4x-12

We move all terms to the left:

2x(x+3)-(-4x-12)=0

We multiply parentheses

2x^2+6x-(-4x-12)=0

We get rid of parentheses

2x^2+6x+4x+12=0

We add all the numbers together, and all the variables

2x^2+10x+12=0

a = 2; b = 10; c = +12;
Δ = b2-4ac
Δ = 102-4·2·12
Δ = 4
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{4}=2$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(10)-2}{2*2}=\frac{-12}{4}
=-3
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(10)+2}{2*2}=\frac{-8}{4}
=-2
$