Test and analysis: find the solution set of inequality | x | 2 | > 1, find two real roots of equation x2+ax+b=0, and find the values of a and b from the relationship between roots and coefficients.
analyse
Solve the inequality | x | 2 | > 1 and get
X < 2 >1or x < 2 >1,
That is x > 3 or x <1;
The two roots of the equation x2+ax+b=0 are 1 and 3,
From the relationship between roots and coefficients, we can get
a=﹣( 1+3)=﹣4,b= 1×3=3.
So choose: C.