X2+2x-4=0 корни плиз. оч нодо

[latex] x^{2} +2x-4=0[/latex] [latex]D= b^{2} -4ac= 2^{2}-4*1*(-4)=4+16=20 [/latex] [latex] x_{1,2} = \frac{-b+- \sqrt{D} }{2a}= \frac{-2+- \sqrt{20} }{2*1}= \frac{-2+- \sqrt{20} }{2}= \left \{ {{x= \frac{-2- \sqrt{20} }{2} } \atop {x= \frac{-2+ \sqrt{20} }{2} }} \right. [/latex]