Davison Cervantes
08/27/2023 · Senior High School
Consider the following function, where \( n \) is a parameter. \( f(x)=\left\{\begin{array}{ll}2 n x+1 & \text { if } x<-1 \\ 7 & \text { if } x=-1 \\ -3 x+3 & \text { if } x>-1\end{array}\right. \) \( \lim _{x \rightarrow-1^{-}} f(x)=\square \) \( \lim _{x \rightarrow-1^{+}} f(x)= \) \( f(-1)= \) Submit Part
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Step-by-step Solution
To analyze the function \( f(x) \) and find the limits and the value at \( x = -1 \), we will evaluate the left-hand limit, the right-hand limit, and the function value at \( x = -1 \).
1. **Left-hand limit as \( x \) approaches -1**:
\[
\lim_{x \rightarrow -1^{-}} f(x) = \lim_{x \rightarrow -1^{-}} (2nx + 1)
\]
Since \( x < -1 \) in this case, we use the first piece of the piecewise function:
\[
= 2n(-1) + 1 = -2n + 1
\]
2. **Right-hand limit as \( x \) approaches -1**:
\[
\lim_{x \rightarrow -1^{+}} f(x) = \lim_{x \rightarrow -1^{+}} (-3x + 3)
\]
Since \( x > -1 \) in this case, we use the third piece of the piecewise function:
\[
= -3(-1) + 3 = 3 + 3 = 6
\]
3. **Value of the function at \( x = -1 \)**:
\[
f(-1) = 7
\]
This is given directly from the second piece of the piecewise function.
Now we can summarize the results:
- \( \lim_{x \rightarrow -1^{-}} f(x) = -2n + 1 \)
- \( \lim_{x \rightarrow -1^{+}} f(x) = 6 \)
- \( f(-1) = 7 \)
Thus, the answers are:
- \( \lim_{x \rightarrow -1^{-}} f(x) = -2n + 1 \)
- \( \lim_{x \rightarrow -1^{+}} f(x) = 6 \)
- \( f(-1) = 7 \)
Quick Answer
- \( \lim_{x \rightarrow -1^{-}} f(x) = -2n + 1 \)
- \( \lim_{x \rightarrow -1^{+}} f(x) = 6 \)
- \( f(-1) = 7 \)
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