Question

关于ax^+bx-2>0 的解集是 (负无穷,-1/2)∪(1/3,正无穷) 求a b

Answer 1

由题意知：x1=-1/2,x2=1/3

x1x2=-1/6=-2/a,a=12

x1+x2=-b/a=-1/6,b=a/6=2