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!

Answer 1

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 ∞

Answer 2

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

Answer 3

Okay, so D would be the best answer.

Answer 4

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

Answer 5

It is, I am sorry.

Answer 6

no probs

Answer 7

Thanks!