[tex]D=0\\D=b^2-4ac=y^2-4\cdot25\cdot2=y^2-200\\y^2-200=0\\y^2=200\\y=\pm \sqrt{200} =\pm 10\sqrt{2}[/tex]
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[tex]D=0\\D=b^2-4ac=y^2-4\cdot25\cdot2=y^2-200\\y^2-200=0\\y^2=200\\y=\pm \sqrt{200} =\pm 10\sqrt{2}[/tex]