if x^2-81=19,what is the product of the solutions?我不明白它这里面说的积（product) 是什么.我知道x=-+10,老师说答案是-100.我觉得可能会是100,因为x^2=100.这道题到底怎么得出答案-100的?

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if x^2-81=19,what is the product of the solutions?我不明白它这里面说的积（product) 是什么.我知道x=-+10,老师说答案是-100.我觉得可能会是100,因为x^2=100.这道题到底怎么得出答案-100的?
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if x^2-81=19,what is the product of the solutions?我不明白它这里面说的积（product) 是什么.我知道x=-+10,老师说答案是-100.我觉得可能会是100,因为x^2=100.这道题到底怎么得出答案-100的?
if x^2-81=19,what is the product of the solutions?
我不明白它这里面说的积（product) 是什么.我知道x=-+10,老师说答案是-100.
我觉得可能会是100,因为x^2=100.这道题到底怎么得出答案-100的?

if x^2-81=19,what is the product of the solutions?我不明白它这里面说的积（product) 是什么.我知道x=-+10,老师说答案是-100.我觉得可能会是100,因为x^2=100.这道题到底怎么得出答案-100的?
乘积嘛~根号100=正负10,那么乘积-10*10=-100
如果是100的话,那么X=10,但是此时只有一个解,无法构成乘积~
希望没错~

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