(x+3)(x-5)
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(x+3)(x-5)(x+3)(x-5)(x+3)(x-5)(x+3)(x-5)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)不成立的话就
(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
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