已知A={x\x^3+3x^2+2x>0},B={x\x^2+ax+b

已知A={x\x^3+3x^2+2x>0},B={x\x^2+ax+b<=0}且A交B={x\x0-2},求实数a,b的值.

x^3+3x^2+2x=0
x(x+1)(x+2)=0
x1=0,x2=-1,x3=-2
x^3+3x^2+2x>0的范围就是：x>0或者-2