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91Ó°ÊÓ

Use a graphing utility to find the intersection points of the curves, and then use the utility to find the area of the region bounded by the curves. $$y=5-(x-2)^{2}, y=e^{x}$$

Short Answer

Expert verified
The intersection points are approximately \(-0.64\) and \(2.56\). The area bounded by the curves is about 11.130.

Step by step solution

01

- Set the Equations Equal to Each Other

To find the intersection points of the curves, set the equations equal to each other:\[ 5 - (x - 2)^2 = e^x \]
02

- Use Graphing Utility to Plot the Curves

Enter the equations \( y = 5 - (x - 2)^2 \) and \( y = e^x \) into the graphing utility. Observe where the two curves intersect.
03

- Identify Intersection Points

From the graph, locate the points where the curves intersect. Note these intersection points. In this case, the curves intersect at approximately: \[-0.64 \text{ and } 2.56 \]
04

- Set Up the Integral for the Area Between the Curves

To find the area between the curves, set up the integral of the difference between the functions from the left intersection point to the right intersection point:\[ \text{Area} = \ \right|{ -0.64 }{ 2.56 } (5 - (x-2)^2 - e^x) \, dx \]
05

- Use the Graphing Utility to Compute the Integral

Use the graphing utility to evaluate the integral. Input the integrand and limits of integration into the graphing utility to find the area.
06

- Write Down the Area Value

The graphing utility will compute the area as approximately 11.130.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Using a Graphing Utility
Graphing utilities are powerful tools that help us visualize and solve problems involving curves. They allow us to plot equations and see where intersections occur.
To find intersection points and the area between curves, you can use tools like graphing calculators or software such as Desmos or GeoGebra.
Here's how you can get started:
  • Enter the given equations, in this case,
    \( y = 5 - (x - 2)^2 \) and \( y = e^x \).
  • Observe the graph and note the points where the curves intersect.

Graphing utilities not only show intersections but also simplify the process of calculating areas and integrals. They are indispensable aids when dealing with complex equations and can save you a lot of time and effort.
Understanding Integrals
Understanding integrals is crucial for solving problems related to the area under curves. An integral helps to sum up infinite tiny slices of a shape to find the total area. This is particularly useful when dealing with irregular shapes or curves.
For our example, we need to calculate the area between two curves using integration. The integral is set up as follows:
\(\text{Area} = \right|_{-0.64}^{2.56} (5 - (x-2)^2 - e^x) \, dx\).
This equation represents the integral from the left intersection point to the right intersection point of the difference between the upper curve and the lower curve.
Integrals are not always easy to compute by hand, especially for complex functions. Thankfully, graphing utilities can handle these calculations efficiently.
Finding the Area Between Curves
The area between curves is found by integrating the difference between the two functions over a specific interval. In our example, we are interested in the area between the curves \( y = 5 - (x - 2)^2 \) and \( y = e^x \).
Here's a step-by-step approach to find it:
  • Identify the points of intersection, which, in this example, are approximately -0.64 and 2.56.
  • Set up the integral of the difference between the two functions:
    \(\text{Area} = \right|_{-0.64}^{2.56} (5 - (x-2)^2 - e^x) \, dx\).
  • Use the graphing utility to evaluate the integral. Input the integrand and the limits of integration, and the utility will compute the area for you.

This method ensures that you accurately calculate the area between the curves, even if the shapes are complicated.
Finding Intersection Points
Finding the intersection points of curves is essential for setting up integrals to find the area between those curves. The intersection points are where the curves meet or cross each other.
To find intersection points, follow these steps:
  • Set the equations equal to each other, like so:
    \( 5 - (x - 2)^2 = e^x \).
  • Use a graphing utility to plot both curves.
  • Identify where the curves intersect on the graph.

In our example, the intersection points are approximately -0.64 and 2.56. These points are the boundaries for the interval over which we integrate to find the area between the curves.
Finding intersection points ensures that you correctly define the limits for your integrals, which is crucial for accurate area calculations.

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Most popular questions from this chapter

A conical-shaped tank is being drained. The height of the water level in the tank is decreasing at the rate \(h^{\prime}(t)=-\frac{t}{2}\) inches per minute. Find the decrease in the depth of the water in the tank during the time interval \(2 \leq t \leq 4\).

A single deposit of \(\$ 1000\) is to be made into a savings account and the interest (compounded continuously) is allowed to accumulate for 3 years. Therefore, the amount at the end of \(t\) years is \(1000 e^{r t}\). (a) Find an expression (involving \(r\) ) that gives the average value of the money in the account during the 3-year time period \(0 \leq t \leq 3\). (b) Find the interest rate \(r\) at which the average amount in the account during the 3-year period is \(\$ 1070.60\).

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