Question: Use the graph to determine a. the function’s domain; b. the function’s range; c. the x-intercepts, if any; d. the y-intercept, if there is one; e. the following function values.
f(-4)
f(1)
a. What is the domain?
(-\infty,\infty) (Type your answer in interval notation.)
b. What is the range?
[-4,\infty) (Type your answer in interval notation.)
Graph: top-right. A blue piecewise line rises from the bottom-left with a left arrow, goes through the point (-4, -4), then continues horizontally right along y = -2 with a right arrow; the graph is in the top-right of the page.
1. **State the problem:**
We are given a graph of a piecewise function and need to find:
a. The domain
b. The range
c. The x-intercepts
d. The y-intercept
e. The values of the function at $x=-4$ and $x=1$
2. **Domain:**
The domain is the set of all possible $x$ values for which the function is defined.
- The graph extends infinitely to the left (indicated by the left arrow) and infinitely to the right (right arrow).
- Therefore, the domain is all real numbers.
$$\text{Domain} = (-\infty, \infty)$$
3. **Range:**
The range is the set of all possible $y$ values the function takes.
- The graph passes through $(-4, -4)$ and then continues horizontally at $y = -2$ to the right.
- The lowest $y$ value is $-4$ and the function goes up to infinity (since the left part rises infinitely).
$$\text{Range} = [-4, \infty)$$
4. **X-intercepts:**
Points where the graph crosses the $x$-axis ($y=0$).
- From the description, the graph does not cross or touch the $x$-axis.
$$\text{X-intercepts} = \varnothing$$
5. **Y-intercept:**
Point where the graph crosses the $y$-axis ($x=0$).
- The horizontal part of the graph is at $y = -2$ for $x > -4$.
- At $x=0$, the function value is $-2$.
$$\text{Y-intercept} = (0, -2)$$
6. **Function values:**
- $f(-4)$ is the $y$ value at $x=-4$, which is $-4$.
- $f(1)$ is the $y$ value at $x=1$, which lies on the horizontal line $y=-2$.
$$f(-4) = -4$$
$$f(1) = -2$$
**Final answers:**
- Domain: $(-\infty, \infty)$
- Range: $[-4, \infty)$
- X-intercepts: None
- Y-intercept: $(0, -2)$
- $f(-4) = -4$
- $f(1) = -2$