A:Ann's birthday.
B:The boy's birthday.
C:April Fool's Day.
(Ⅰ)试比较f(﹣1)与f(a)的大小;
(Ⅱ)当a≥﹣1时,若函数f(x)的图象和x轴围成一个三角形,则实数a的取值范围.
已知:整数a、b满足ab=﹣6,则ab的值有( )