[tex]\displaystyle 5x^2+8x-9=0\\D=8^2-4*5(-9)=244\\\\x=\frac{-8б\sqrt{244} }{10}=\frac{-8б2\sqrt{61} }{10}=\frac{-4б\sqrt{61} }{5}[/tex]
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[tex]\displaystyle 5x^2+8x-9=0\\D=8^2-4*5(-9)=244\\\\x=\frac{-8б\sqrt{244} }{10}=\frac{-8б2\sqrt{61} }{10}=\frac{-4б\sqrt{61} }{5}[/tex]