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1. \(x^2-5x+4=0\) ,

\(a=1\) , \(b=-5\) , \(c=4\) ,

\(D=25-4\cdot 1\cdot 4=9\) ,

\(\sqrt{D}=3\) ;

2. \(x^2+6x+8=0\) ,

\(a=\) [ ], \(b=\) [ ], \(c=\) [ ],

\(D=\) [ ],

\(\sqrt{D}=\) [ ];

3. \(2x^2+3x-2=0\) ,

\(a=\) [ ], \(b=\) [ ], \(c=\) [ ],

\(D=\) [ ],

\(\sqrt{D}=\) [ ];

4. \(−x^2+7x+18=0\) ,

\(a=\) [ ], \(b=\) [ ], \(c=\) [ ],

\(D=\) [ ],

\(\sqrt{D}=\) [ ];

5. \(−2x^2+7x-3=0\) ,

\(a=\) [ ], \(b=\) [ ], \(c=\) [ ],

\(D=\) [ ],

\(\sqrt{D}=\) [ ];

6. \(\dfrac{1}{2}x^2-2=0\) ,

\(a=\) [ ], \(b=\) [ ], \(c=\) [ ],

\(D=\) [ ],

\(\sqrt{D}=\) [ ];

7. \(-3x^2+\dfrac{1}{3}=0\) ,

\(a=\) [ ], \(b=\) [ ], \(c=\) [ ],

\(D=\) [ ],

\(\sqrt{D}=\) [ ];

8. \(5x^2-x=0\) ,

\(a=\) [ ], \(b=\) [ ], \(c=\) [ ],

\(D=\) [ ],

\(\sqrt{D}=\) [ ];

9. \(x^2-6x+9=0\) ,

\(a=\) [ ], \(b=\) [ ], \(c=\) [ ],

\(D=\) [ ],

\(\sqrt{D}=\) [ ].