\ x=3\\
|x+4=0\ => \ x=-4\\
\\
x^2-9=0\\
(x-3)*(x+3)=0\\
|x-3=0\ =>\ x=3\\
|x+3=0\ =>\ x=-3\\
\\
16-x^2=0\\
(4-x)*(4+x)=0\\
|4-x=0\ =>\ x=4\\
|4+x=0\ =>\ x=-4" alt="(x-3)*(x+4)=0\\
|x-3=0\ => \ x=3\\
|x+4=0\ => \ x=-4\\
\\
x^2-9=0\\
(x-3)*(x+3)=0\\
|x-3=0\ =>\ x=3\\
|x+3=0\ =>\ x=-3\\
\\
16-x^2=0\\
(4-x)*(4+x)=0\\
|4-x=0\ =>\ x=4\\
|4+x=0\ =>\ x=-4" align="absmiddle" class="latex-formula">