SAT官方每日一题附答案和解析[数学](2019年12月23日)
日期:2019-12-23 09:37
(单词翻译:单击)
每日一题
Mathematics>Standard Multiple Choice
Read the following SAT test question and then click on a button to select your answer.
(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:A
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.
重点单词