作业帮(x+3)(x-5)
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/05 16:05:04
(x+3)(x-5) (x+3)(x-5)
(x+3)(x-5)<0 怎么到3
(x+3)(x-5)<0
解得x=-3或x=5是两个零点
之后可以画图（推荐草图）
或者取特殊值比（-3到5之间）
比如x=0, 3*（-5）<0满足题意所以-3
*-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X ||
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