如果 =- 2,则 x+17的平方根为 _________ .

如果 =- 2 ,则 x+17 的平方根为 _________ .

答案

±

【解析】

先根据立方根的定义求出 x 的值,再带入求得 x+17 的平方根即可 .

【详解】

=- 2,

=-8,x=-4,

x+17=13,

x+17 的平方根为 ±

故答案为 ±

【点睛】

此题考查了平方根和立方根的定义,熟练掌握这两个定义是解答问题的关键 .

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