Find the area bounded by the parabolas

In summary, to find the area bounded by two parabolas, you can use integration by breaking down the area into smaller shapes and adding their individual areas together. The steps involved include graphing the parabolas, finding points of intersection, setting up an integral expression, solving the integral, and evaluating the answer. The specific formula used will depend on the parabolas and intersections. This process differs from finding the area under a parabola, which involves a simpler geometric formula. While it is possible to find the area bounded by two parabolas without graphing, it is recommended to graph first for better understanding of the problem.
  • #1
duki
264
0

Homework Statement



find the area bounded by the parabolas [tex]y=2x^2-x-15[/tex] and [tex]y=x^2-4x-5[/tex]

Homework Equations



The Attempt at a Solution



[tex]x^2+3x-10=0[/tex]
I got x = 2 and x = -5; is that right?
If so, why do I keep getting an area of 76.17 when I integrate from -5 to 2? I end up with [tex](2.67+6-20)-(41.67+37.5+50)[/tex]
 
Physics news on Phys.org
  • #2
Graph the equations and then consider calculating the area by integrating them in three parts and adding up the absolute values of the area.
 

1. How do you find the area bounded by two parabolas?

To find the area bounded by two parabolas, you can use a technique called integration. This involves breaking down the area into smaller, simpler shapes and using mathematical formulas to calculate their individual areas. Then, you can add these individual areas together to find the total area bounded by the parabolas.

2. What are the steps for finding the area bounded by two parabolas?

The steps for finding the area bounded by two parabolas are:
1. Graph the two parabolas to visualize the area.
2. Find the points of intersection between the two parabolas.
3. Set up an integral expression to represent the area between the two parabolas.
4. Solve the integral expression using techniques such as substitution or integration by parts.
5. Evaluate the integral and find the final answer for the bounded area.

3. Can you use any formula to find the area bounded by two parabolas?

No, you cannot use any formula to find the area bounded by two parabolas. The formula used depends on the positioning of the parabolas and the points of intersection. In general, you will need to use integration to find the area, but the specific integral expression will vary depending on the specific parabolas and their intersections.

4. What is the difference between finding the area bounded by two parabolas and finding the area under a parabola?

Finding the area under a parabola involves finding the area between the parabola and the x-axis. This can be done using a simple geometric formula. However, finding the area bounded by two parabolas involves finding the area between two parabolas, which is a more complex process that requires integration.

5. Can you find the area bounded by two parabolas without graphing?

Yes, you can find the area bounded by two parabolas without graphing, but it may be more difficult to visualize the area and understand the problem without a visual representation. It is recommended to graph the parabolas first to better understand the problem before attempting to find the area using integration.

Similar threads

  • Calculus and Beyond Homework Help
Replies
10
Views
445
  • Calculus and Beyond Homework Help
Replies
1
Views
463
  • Calculus and Beyond Homework Help
Replies
5
Views
1K
  • Calculus and Beyond Homework Help
Replies
1
Views
914
  • Calculus and Beyond Homework Help
Replies
6
Views
952
  • Calculus and Beyond Homework Help
Replies
7
Views
1K
  • Calculus and Beyond Homework Help
Replies
17
Views
2K
  • Calculus and Beyond Homework Help
Replies
22
Views
1K
  • Calculus and Beyond Homework Help
Replies
3
Views
1K
  • Calculus and Beyond Homework Help
Replies
4
Views
1K
Back
Top