X^2+3x+2=0 Помогите пожалуйста

[latex] x^{2} +3x+2=0 [/latex]  D=[latex] b^{2} [/latex]-4ac D=9-8=1 [latex] \left \{ {{ x_{1}= \frac{- b+ \sqrt{D}}{2a} } } \atop { x_{2} = \frac{- b- \sqrt{D}}{2a} }} \right. [/latex][latex] \left \{ {{ x_{1}= \frac{- 3+ 1}{2} } \atop {x_{2}= \frac{- 3- 1}{2}}} \right. [/latex][latex] \left \{ {{x_{1}= -1}} \atop { x_{2}=-2 }} \right. [/latex]