Question

Write the interval notation corresponding to the set notation

{x | x < –7}

Answer 1

For the interval notation, ( and ) correspond to excluding the lower and upper limits. While [ and ] imply the inclusion of the lower and upper limits.
The two limits are separated by a comma.

Thus
[-5,8) is the same as {x|-5=<x<8}

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

See also
http://www.jiskha.com/display.cgi?id=1243999516

Answer 2

Would this work as well to represent that answer? (-infintity symbol, -7)

Answer 3

Yes, definitely.
I would have put the infinity symbol if I could get it posted correctly.
Note also that negative infinity itself has been <i>excluded</i> from the interval because of the parenthesis instead of the square bracket.

Answer 4

Thanks for you help!

Answer 5

Hope you got your answer AND understood well the interval notation.