Question

不等式(x-2)

x2-2x-3

≥0的解集是 ______．

Answer 1

不等式等價于

x-2≥0 x 2-2x-3≥0

或

x-2＜0 x2-2x-3 =0

解得x≥3或x=-1
故答案為：{x|x≥3或x=-1}