$x^2+4=0$x^2+4=0

$\displaystyle \frac{x+2}{2}=1$\displaystyle \frac{x+2}{2}=1

$\displaystyle \frac{x}{x+2} =0$\displaystyle \frac{x}{x+2} =0

$x^2\left(x+2\right)+2\left(x+2\right)=0$x^2\left(x+2\right)+2\left(x+2\right)=0