
f(x) =x^2+ax+a-2
f(1)=0
1+a+a-2 = 0
a= 1/2
f(x) =x^2+(1/2)x+(1/2)-2
x^2+(1/2)x+(1/2)-2 = 0
2x^2+x-3 = 0
(x-1)(2x+3)=0
x=1 or -3/2
另外一个根=-3/2

f(x) =x^2+ax+a-2
f(1)=0
1+a+a-2 = 0
a= 1/2
f(x) =x^2+(1/2)x+(1/2)-2
x^2+(1/2)x+(1/2)-2 = 0
2x^2+x-3 = 0
(x-1)(2x+3)=0
x=1 or -3/2
另外一个根=-3/2