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Linear Inequalities: Error in book?

  1. Jan 1, 2008 #1
    Give the interval notation for the inequality: [tex]\displaystyle{x\leq -2[/tex]

    My answer is: [tex]\displaystyle{(-\infty, -2]}[/tex]

    Book answer is: [tex]\displaystyle{(\infty, -2]}[/tex]

    ?????
     
  2. jcsd
  3. Jan 1, 2008 #2

    mathman

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    Gold Member

    You're right. Looks like a typo in the book.
     
  4. Jan 1, 2008 #3

    Thanks. This book is absolutely riddled with errors of this type; enough to make you often doubt yourself after successfully completing some problems.

    I hope the editor doesn't have any competition...:rolleyes:
     
  5. Jan 1, 2008 #4
    When you read stuff like that you should know that it has to be a typo, because you know that it cannot make sense.
     
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