X в крадрате + 12X+20=0

[latex] x^{2} +12x+20=0[/latex] [latex]D=b^2-4ac=12^2-4*1*20=144-80=64[/latex] [latex] \sqrt{D}= \sqrt{64}=8[/latex] [latex] x_{1}= \frac{-b+ \sqrt{D} }{2a}= \frac{-12+8}{2}= \frac{-4}{2}=-2[/latex] [latex] x_{2}= \frac{-b- \sqrt{D} }{2a}= \frac{-12-8}{2}= \frac{-20}{2}=-10[/latex] Ответ: - 2 ; - 10 .