Determine if the endpoints for the following piecewise function are opened or closed

-3 x < 2
{2 x ≤ x < 4
5 x ≥ 4

(Answers)

4,2
4,5
2,2
2, -3

1 answer

In the given piecewise function:

  • For \( x < 2 \), the function takes the value -3.
  • For \( 2 \leq x < 4 \), the function takes the value 2.
  • For \( x \geq 4 \), the function takes the value 5.

Now, let's analyze the endpoints:

  1. For \( x < 2 \), the endpoint at \( x = 2 \) is not included (it's an open interval on the left side), so we denote that endpoint as open.

  2. For \( 2 \leq x < 4 \), the endpoint at \( x = 2 \) is included (it's a closed interval on the left side) and the endpoint at \( x = 4 \) is not included (it's an open interval on the right side). So, \( x = 2 \) is closed and \( x = 4 \) is open.

  3. For \( x \geq 4 \), the endpoint at \( x = 4 \) is included (it's a closed interval on the left side) but we've already noted that in the previous interval it was treated as open.

Thus, summarizing:

  • The endpoint at \( x = 2 \) is closed.
  • The endpoint at \( x = 4 \) is closed but treated as open due to the different interval definitions earlier.

Therefore, the correct notation for endpoints is:

  • \( x = 2 \) (closed)
  • \( x = 4 \) (open)

Given the options and focusing specifically on closed and open practices (with the first appearing intervals):

The answer is (2, 4) where \( 2 \) is closed and \( 4 \) is open, matching the situation precisely with the patterns considered.

The endpoints you would write are:

  • \( 2 \) is closed: \( [2 \)
  • \( 4 \) is open: \( 4) \)

So the correct pairing from your answers is \( 2, 2 \) denoting that the value at \( 2 \) has a point. The pairing yields:

  • The inclusion at \( 2 \) seen as closed \([2]\)
  • The value at \( 4 \) treated open (disregard its value in function previous intervals).

Thus the pairs coordinates yielding open/closed status denote: 2, 2 or also upon refining down could indicate restrictions set \( 4,5 \) if applied correctly.

To summarize considering pointed confines ** answer is ** (2,2) and also consider \( (4,\) being open indicating alternate options being true.