How many real roots does the polynomial 2x^5+8x-7 have?

来源：学生作业帮编辑：百度作业网作业帮分类：数学作业时间：2024/07/22 15:41:03

How many real roots does the polynomial 2x^5+8x-7 have?
(A)None (B)One(C)Two(D)Three(E)Five

不一定对
思路：2x^5+8x-7 =0
2x^5+8x=7
2x(x^4+8)=7
可以确定x只能是正值,解只能有一个
麻烦有正确答案后告知一下哈哈
再问：此题是选B,可为什么x只能是正值解就只能有一个呢
再答： x^4+8 一定是正值，2x(x^4+8)=7就相当于一元一次方程，例如：6X=9 你说X解有几个？如果答案中有具体的解释，我还是很期待看看他怎么解释的哈哈

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