Решите квадратное уравнение [latex]- x^{2} +2x+1 =0[/latex]

[latex] {-x^2+2x+1=0} [/latex] [latex]{a=-1} [/latex] [latex]{b=2} [/latex] [latex]{c=1} [/latex] [latex]{D=8} [/latex] [latex]{x= \frac{-2- \sqrt{8} }{-2}= \frac{-2-2 \sqrt{2} }{-2}= \frac{-2(1+ \sqrt{2)} }{-2}=1+ \sqrt{2} } [/latex] [latex]{x= \frac{-2+2 \sqrt{2} }{-2}= \frac{-2(1- \sqrt{2)} }{-2}=1- \sqrt{2} } [/latex]