Function Comparison
1. **State the problem:** We are given the graph of function $f(x)$, which forms a "V" shape centered at the origin $(0,0)$. We want to compare $f(x)$ to the function $$g(x) = -2|x - 3|$$ and determine which statement about their intercepts, domain, or range is correct.
2. **Analyze $f(x)$ from the graph:**
- The vertex of $f(x)$ is at the origin $(0,0)$.
- Since the graph forms a "V" shape opening upwards and downwards, let's identify the exact equation shape.
- The left line passes through $(-2,4)$ and $(-4,8)$, so slope is $$m = \frac{8 - 4}{-4 + 2} = \frac{4}{-2} = -2.$$ The right line passes through $(2,4)$ and $(4,8)$ with slope $$m = \frac{8 - 4}{4 - 2} = \frac{4}{2} = 2.$$
- This means:
- For $x < 0$, $f(x) = -2x$ (lines with negative slope)
- For $x > 0$, $f(x) = 2x$ (line with positive slope)
- The function $f(x)$ can be described as $$f(x) = 2|x|.$$ Its vertex is at $(0,0)$.
3. **Analyze $g(x) = -2|x - 3|$:**
- The vertex is at $x=3$ because of $|x-3|$.
- $g(3) = -2|3-3| = 0$ so the vertex is at $(3,0)$.
- The graph opens downward because of the negative coefficient $-2$.
4. **Compare the statements:**
- **Same x-intercept?**
- $f(x)$ has x-intercept where $f(x) = 0$, which occurs at $x=0$.
- $g(x)$ has x-intercept where $g(x)=0$, at $x=3$.
- No, different x-intercepts.
- **Same y-intercept?**
- $f(0) = 2|0| = 0$, so y-intercept is $0$.
- $g(0) = -2|0-3| = -2| -3| = -2\times 3 = -6$, y-intercept is $-6$.
- No, different y-intercepts.
- **Same domain?**
- Both are absolute value functions, defined for all real numbers.
- Yes, both have domain $(-\infty, \infty)$.
- **Same range?**
- $f(x) = 2|x|$ yields values $\geq 0$ (range $[0, \infty)$).
- $g(x) = -2|x-3|$ yields values $\leq 0$ (range $(-\infty, 0]$).
- No, different ranges.
5. **Conclusion:** The correct statement is **The function $f(x)$ has the same domain as $g(x)$**.
Final answer: The function $f(x)$ and the function $g(x) = -2|x - 3|$ have the same domain.