4. Consider the exponential function y = -3-2-*+5 a. Algebraically determine the exact value of the y-intercept.

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## Transcription of Exponential Function Analysis

**4. Consider the exponential function \( y = -3 - 2^{-x} + 5 \)**

### a. Algebraically determine the exact value of the y-intercept.

To find the y-intercept, substitute \( x = 0 \) into the equation:

\[ y = -3 - 2^{-(0)} + 5 \]

\[ y = -3 - 1 + 5 \]

\[ y = 4 \]

Thus, the y-intercept is \( (0, 4) \).

### b. Complete the table. Show transformations for determining critical points.

|                          |                                  |
|--------------------------|----------------------------------|
| **Parent Function**      | \( 2^x \)                        |
|                          | \( (0,1) \)                     |
| **Critical Point**       | \( (5, -2) \)                    |
| **Intercepts**           | x-intercept: none                |
|                          | y-intercept: \( (0, 4) \)       |
| **Asymptotes**           | \( y = -3 \)                     |
|                          | x = none                         |
| **Domain**               | \( \mathbb{R} \)                 |
| **Interval \( f(x) \) is decreasing** | \( \mathbb{R} \)          |
| **End Behavior**         | As \( x \to -\infty, y \to -3 \) |

### c. Sketch the graph showing the critical point, all intercepts, and asymptotes.

- The graph is not shown in detail due to the medium; however, it illustrates an exponential curve, reflecting the described function characteristics and manipulation. 
- The critical point is at \( (5, -2) \).
- The horizontal asymptote at \( y = -3 \) is indicated by a horizontal dashed line.
- There is no x-intercept present.
- The curve approaches the asymptote as \( x \) decreases toward negative infinity.
Transcribed Image Text:## Transcription of Exponential Function Analysis **4. Consider the exponential function \( y = -3 - 2^{-x} + 5 \)** ### a. Algebraically determine the exact value of the y-intercept. To find the y-intercept, substitute \( x = 0 \) into the equation: \[ y = -3 - 2^{-(0)} + 5 \] \[ y = -3 - 1 + 5 \] \[ y = 4 \] Thus, the y-intercept is \( (0, 4) \). ### b. Complete the table. Show transformations for determining critical points. | | | |--------------------------|----------------------------------| | **Parent Function** | \( 2^x \) | | | \( (0,1) \) | | **Critical Point** | \( (5, -2) \) | | **Intercepts** | x-intercept: none | | | y-intercept: \( (0, 4) \) | | **Asymptotes** | \( y = -3 \) | | | x = none | | **Domain** | \( \mathbb{R} \) | | **Interval \( f(x) \) is decreasing** | \( \mathbb{R} \) | | **End Behavior** | As \( x \to -\infty, y \to -3 \) | ### c. Sketch the graph showing the critical point, all intercepts, and asymptotes. - The graph is not shown in detail due to the medium; however, it illustrates an exponential curve, reflecting the described function characteristics and manipulation. - The critical point is at \( (5, -2) \). - The horizontal asymptote at \( y = -3 \) is indicated by a horizontal dashed line. - There is no x-intercept present. - The curve approaches the asymptote as \( x \) decreases toward negative infinity.
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