Question

A student writes the inequality x > 17 in interval notation as [17, POS INF]. Explain why this is incorrect.

Answer 1

Answer:

see explanation

Step-by-step explanation:

[ 17, + ∞ ] are used to indicate that the values inside are equal to the 2 limits, that is that x can equal 17 or + ∞

However, this as not the case as x > 17 indicates x is greater than 17 but not equal to it. This is also true for + ∞

To represent this situation parenthesis is used, that is

(17, + ∞ )