Which expresses the inequality x

Question

Which expresses the inequality x < 2 in interval notation?

 (∞, 2]

(2, ∞)

[2, ∞)

(∞, 2)

Can someone explain this to me? I don't know how to do this!

welshfella · Answer

first of all the round parentheses ( and ) mean the number next to it is not included in the inequality. The square parentheses [   and ] mean the number is included. ( and ) are always used for the infinity symbol ∞

welshfella · Answer

here we have < 2 ( less than 2) so it will be (something, 2)

anonymous · Answer

Okay, so D would be the best answer.

welshfella · Answer

When i looked first I thought it was D but that is not strictly correct  as its all numbers less that 2 that should be -∞ ( - infinity)

maybe it was a typo

anonymous · Answer

It is, I am sorry.

welshfella · Answer

no probs

anonymous · Answer

Thanks!