Linear Inequalities: Error in book?

[Holocene]

Give the interval notation for the inequality: \displaystyle{x\leq -2

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

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

?

 

[mathman]

You're right. Looks like a typo in the book.

 

[Holocene]

You're right. Looks like a typo in the book.

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...

 

[mathboy]

When you read stuff like that you should know that it has to be a typo, because you know that it cannot make sense.