2. 外语
  3. What are all of the values of x that satisfy the equation x2-2x-3=0?

What are all of the values of x that satisfy the equation x2-2x-3=0?

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问题 What are all of the values of x that satisfy the equation x2-2x-3=0?
选项 A、-1
B、-2/3
C、-1/2
D、0
E、1
答案A
解析 利用因式分解法得到：(x-3)(x+1)=0，于是有x1=3，x2=-1。
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