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SAT官方每日一题附答案和解析[数学](2018年6月13日)
日期:2018-06-13 09:50

(单词翻译:单击)

每日一题

Mathematics

(x+10000)(x+10000)=0

How many unique real solutions does the equation above have?

A.0
B.1
C.2
D.4

答案和解析

答案:B

解析:

Choice B is correct. The left-hand side of the equation can only be zero when one of the factors is zero.

If the first factor is zero, then x=-10000.

If the second factor is zero, then x=-10000.

These are both the same solution. So there is only 1 unique solution. This solution is also real.

The equation has 1 unique real solution.

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