0\\ x^{2} +4x+3=0 \\ D=4 ^{2} -4*3*1=16-12=4 \\ \sqrt{D} =2 \\ x_{1} = \frac{-4+2}{2} = \frac{-2}{2} =-1 \\ x_{2} = \frac{-4-2}{2} = \frac{-6}{1} =-3" alt=" x^{2} +4x+3>0\\ x^{2} +4x+3=0 \\ D=4 ^{2} -4*3*1=16-12=4 \\ \sqrt{D} =2 \\ x_{1} = \frac{-4+2}{2} = \frac{-2}{2} =-1 \\ x_{2} = \frac{-4-2}{2} = \frac{-6}{1} =-3" align="absmiddle" class="latex-formula">
+ - +
-------------|----------------------------|------------------> x
-3 -1
x∈