1, the coefficient of the first term is -3.

2, the value of discriminant is 9-8 = 1.

3, the discriminant is p? -4q .

4. (If there are real roots) The sum of the two roots is-P. ..

5. The condition that there are two equal real roots is p? -4q=0 .

6， 1/x？ + 1/x？ =4p/(p？ +p-4 level).

7、x+x=p？ /2 Q.

8. The condition of having a real root is b+4ac≥0.