[tex]\displaystyle x^2+6x-11=0\\\\x=\frac{-6б\sqrt{6^2-4*1*(-11)} }{2*1}=\frac{-6б\sqrt{36+44} }{2}=\frac{-6б\sqrt{80} }{2}=\frac{-6б4\sqrt{5} }{2}=\\-3б2\sqrt{5}[/tex]
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[tex]\displaystyle x^2+6x-11=0\\\\x=\frac{-6б\sqrt{6^2-4*1*(-11)} }{2*1}=\frac{-6б\sqrt{36+44} }{2}=\frac{-6б\sqrt{80} }{2}=\frac{-6б4\sqrt{5} }{2}=\\-3б2\sqrt{5}[/tex]