Discontinuity Types 1954Bd
1. **Problem Statement:** We are analyzing different types of discontinuities in functions at specific points: at $x=-1$, $x=1$, $x=2$, and $x=0$.
2. **Key Concepts:**
- A **vertical asymptote** occurs where the function grows without bound (to $+\infty$ or $-\infty$).
- A **jump discontinuity** occurs when the left-hand and right-hand limits exist but are not equal.
- A **hole** (removable discontinuity) occurs when the limit exists but the function is not defined or differs at that point.
- **Continuity** means the function value equals the limit at that point.
3. **At $x=-1$ (Vertical Asymptote and Hole):**
- The function shoots to $+\infty$ as $x \to -1^-$.
- The function approaches $0$ as $x \to -1^+$.
- There is a hole at $(-1,0)$.
4. **At $x=1$ (Hole):**
- The limit as $x \to 1$ is $-1$.
- The function is not defined at $x=1$ (hole).
5. **At $x=2$ (Jump Discontinuity):**
- Left limit: $\lim_{x \to 2^-} f(x) = -2$.
- Right limit: $\lim_{x \to 2^+} f(x) = 2$.
- The function jumps from $-2$ to $2$ at $x=2$.
6. **At $x=0$ (Continuous):**
- The function value is $f(0) = 1$.
- The limit as $x \to 0$ is $1$.
- The function is continuous at $x=0$.
7. **Summary:**
- Vertical asymptote at $x=-1$ with a hole at $(-1,0)$.
- Hole at $x=1$ with limit $-1$ but no function value.
- Jump discontinuity at $x=2$ from $-2$ to $2$.
- Continuous at $x=0$ with value $1$.
This analysis clarifies the behavior of the function at these points and the types of discontinuities present.