# Algebra

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Please solve for the interval notation corresponding to the set notation
{x | x < –7}

• Algebra -

http://www.jiskha.com/display.cgi?id=1243987256

• Algebra -

Thank you, but why is it
(-infinity -7)?

is it translated to
negative infinity - 7?

• Algebra -

> [-5,8) is the same as {x|-5=<x<8}
meaning that the square bracket [ includes the lower limit, while the ] includes the upper limit. The limits are separated by a comma.

You are right in actual practice, it is normal to exclude infinity or negative infinity. In my books, -infinity is a short form for negative infinity.

So the correct answer would be:
(negative infinity, -7)

• Algebra -

Thank you for the explanation!

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