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Let's analyze and solve each problem from the image.

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### 1.1 Limit Calculation:
The given problem is:
\[
\lim_{x \to 5^-} \frac{x + 3}{x - 5}
\]

Here, we are asked to find the left-hand limit as \( x \to 5^- \).

- As \( x \) approaches 5 from the left side, the numerator becomes \( x + 3 = 8 \).
- The denominator, \( x - 5 \), approaches 0, but it remains **negative** because \( x \) is slightly less than 5.

Thus, the expression tends towards \( \frac{8}{\text{small negative number}} \), which means the limit tends to **negative infinity**.

**Answer:**
\[
\lim_{x \to 5^-} \frac{x + 3}{x - 5} = -\infty
\]

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### 2.1 Continuity of the Function \( F(x) \) at \( x = 5 \):
The function \( F(x) \) is given as:
\[
F(x) =
\begin{cases}
\frac{x^2 - 5}{x - 5}, & \text{for } x < 5, \\
a \cdot 5, & \text{for } x = 5, \\
2 \cdot 5, & \text{for } x > 5.
\end{cases}
\]

To check continuity at \( x = 5 \), we need to ensure:
1. \( \lim_{x \to 5^-} F(x) = \lim_{x \to 5^+} F(x) = F(5) \).

#### Left-hand limit (\( x \to 5^- \)):
For \( x < 5 \), \( F(x) = \frac{x^2 - 5}{x - 5} \). We can simplify this by factoring the numerator:
\[
F(x) = \frac{(x - \sqrt{5})(x + \sqrt{5})}{x - 5}.
\]
As \( x \to 5 \), this limit needs further simplification or handling indeterminacies.

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### 3.1 Find the Value of \( a \):
The function \( F(x) \) is given as:
\[
F(x) =
\begin{cases}
x + a, & \text{for } x \leq 5, \\
a \cdot x^2 + 1, & \text{for } x > 5.
\end{cases}
\]
We are asked to find \( a \) so that the function is continuous at \( x = 5 \).

For continuity at \( x = 5 \), we need:
\[
\lim_{x \to 5^-} F(x) = \lim_{x \to 5^+} F(x) = F(5).
\]
Let me solve these calculations for you!For the function \( F(x) \) to be continuous at \( x = 5 \), we need the left-hand limit to equal the right-hand limit.

- The left-hand limit is \( a + 5 \).
- The right-hand limit is \( 25a + 1 \).

Setting them equal to each other:

\[
a + 5 = 25a + 1
\]

Solving this equation gives \( a = \frac{1}{6} \).

Thus, the value of \( a \) for which the function is continuous at \( x = 5 \) is \( a = \frac{1}{6} \).

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Would you like further details on these solutions or clarifications? Here are some related questions to consider:

1. What is the significance of limits in ensuring continuity?
2. How do you solve limits that approach infinity?
3. What does a negative infinity limit tell us about the behavior of a function?
4. How can factoring help simplify limit problems involving indeterminate forms?
5. What steps would be required to evaluate higher-degree polynomial limits?

**Tip:** Always check both left-hand and right-hand limits when determining the continuity of a function at a point.

1) Tentukan nilai dari limit: lim x→5- (x + 3) / (x - 5); 2) Solidi ke kontinuan di x = 5 pada F(x); 3) Tentukan nilai a agar F(x) kontinu pada x = 5.

Learn how to solve a limit problem and check continuity at x = 5 for the piecewise function F(x). This exercise involves understanding limits from the left and right, and ensuring function continuity through solving for variables.

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