Another cool optimization problem

In summary, the conversation discusses finding the dimensions of a rectangle with a perimeter of 100m and the largest possible area. The equations of area = XY and 100 = 2x + 2y are used to solve for the dimensions. The final solution is x = 25 and y = 25, resulting in a maximum area of 625m^2 for the rectangle. The conversation also mentions the importance of being careful with algebra and arithmetic when solving math problems.
  • #1
physicsed
52
0

Homework Statement



find the dimensions of a rectangle with perimeter 100m whose area is as large as possible


Homework Equations



area = XY

100 = 2x + 2y

y= 100/4x

x(100/4x)

(400x - 400x)/16x^2

1/16x^2 = 0

The Attempt at a Solution



well...
am lost
 
Physics news on Phys.org
  • #2
y=100/4x, reconsider that step. You are having the same trouble as in your other question. You need to be more careful in your algebra/arithmetic.
 
  • #3
2y = 100/2x

y = (100/2x) * .5
 
  • #4
How are you getting from 100=2x+2y to 2y=100/2x?
 
  • #5
am trying to solve for y
 
  • #6
y = (100/2)-x
 
  • #7
Ok that's better (100/2=50).

So what's the next step.
 
  • #8
find the derivates of 50x-x^2
50-2x=0
x=25
100=2(25)+2y
 
  • #9
y= 25
 
  • #10
Yep, that's it.
 
  • #11
thanks alot. care for one more problem?
 
  • #12
Suggest you start a new thread. Some people don't pay much attention to threads with large numbers of posts. Including me, usually. This is an exception.
 

1. What is an optimization problem?

An optimization problem is a mathematical problem that involves finding the best solution among a set of possible solutions. The goal is to minimize or maximize a particular objective function while satisfying certain constraints.

2. Why are optimization problems important?

Optimization problems are important because they have applications in various fields such as engineering, economics, and computer science. They help in making efficient use of resources and improving decision-making processes.

3. What are some common techniques used to solve optimization problems?

Some common techniques used to solve optimization problems include linear programming, dynamic programming, and gradient descent. Other methods such as simulated annealing, genetic algorithms, and ant colony optimization are also commonly used.

4. What are some real-life examples of optimization problems?

Real-life examples of optimization problems include finding the shortest route for a delivery truck, maximizing profit for a company, and minimizing energy consumption in a building. Other examples include scheduling tasks in a project, optimizing the placement of cell phone towers, and designing efficient transportation systems.

5. How can optimization problems be solved efficiently?

Optimization problems can be solved efficiently by using appropriate techniques and algorithms, considering all constraints and variables, and making use of computers and software tools. It is also important to formulate the problem correctly and regularly review and adjust the solution approach for better results.

Similar threads

  • Calculus and Beyond Homework Help
Replies
1
Views
454
  • Calculus and Beyond Homework Help
Replies
4
Views
1K
  • Calculus and Beyond Homework Help
Replies
2
Views
440
  • Calculus and Beyond Homework Help
Replies
3
Views
1K
  • Calculus and Beyond Homework Help
Replies
5
Views
1K
  • Calculus and Beyond Homework Help
Replies
6
Views
1K
  • Calculus and Beyond Homework Help
Replies
2
Views
5K
  • Calculus and Beyond Homework Help
Replies
24
Views
2K
  • Calculus and Beyond Homework Help
Replies
5
Views
2K
  • Calculus and Beyond Homework Help
Replies
17
Views
1K
Back
Top