题目

当-2≤x≤1时，二次函数若 有最大值4，则m的值为_____． 答案：【答案】2或-【解析】求出二次函数对称轴为直线x=m，再分m＜-2，-2≤m≤1，m＞1三种情况，根据二次函数的增减性列方程求解即可．解：二次函数对称轴为直线x=m，①m＜-2时，x=-2取得最大值，-（-2-m）2+m2+1=4，解得，m=-，∵-＞-2，∴不符合题意，②-2≤m≤1时，x=m取得最大值，m2+1=4，解得m=±，所以，m=-，The basketball coach, as well as his team, ______interviewed shortly after the match for their outstanding performance. [     ]A. wereB. wasC. isD. are