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.