225k views
2 votes
Graphing + Functions

Graphing + Functions-example-1
User ReSPAWNed
by
8.2k points

2 Answers

3 votes
Hey there!

a. To start, the domain of a function is the range of x values a graph has.

In the graph shown, you have a graph with x values that range from -4 to 0.

However, notice in the graph, there is a hole at the point (-4,6). This hole means that in the function, the domain value of -4 is not included in the domain.

Therefore, to represent your domain in interval notation, you would have:
(-4, 0]

**a parenthesis before a value signifies the value is not included (-4 is not included due to the hole) and a bracket signifies the value is included.

b. The range of a function is the range of y values the function has. Notice how the function's values range from -9 to 6, however there is a hole in the y value of 6 meaning it is not included. Therefore, your range should be [-9, 6).

c. To start, the x-intercept of a graph is the point in which the line passes through the x axis. In the graph shown, the line passes through the x axis at (-3,0). Therefore, your x-intercept would be (-3,0).

d. Similar to the x-intercept, the y-intercept of a graph is the point in which the line passes through the y-intercept. In the graph shown, the line passes through the y axis at (0,-9). Therefore, your y-intercept would be (0,-9).

e. To find the function value in the graph, first locate -2, the given value in f(-2), on the x-axis. Now, trace the point towards the line to find where the x values of -2 lies on the graph, which would be at point (-2,-5). Knowing this, f(-2) would be -5, the y value of the point.

Hope this helps and have a wonderful day! :)
User Seyit
by
8.4k points
3 votes

domain = the X axis so (-4,0)

range = the Y axis so (-9,7)

x intercept = where line crosses x axis so (-3,0)

y intercept = where line starts on y axis so (0,-9)

f(-2) = where line is on y at x -2 = -5

User Gopaul
by
8.3k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories