Reducing to First-Order Equation

  • Thread starter Banana
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In summary, first-order equations are mathematical equations that contain only first-order derivatives. They are important because they are easier to solve and commonly used in real-world applications. To reduce a higher-order equation to a first-order equation, techniques such as substitution, integration, or separation of variables can be used. However, not all higher-order equations can be reduced to first-order equations. First-order equations are commonly used in physics, chemistry, biology, and engineering to model and analyze various phenomena.
  • #1
Banana
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Can someone double check me please? I'm not sure if it matters that the fourth and first orders are missing.

Reduce to a first-order equation:

2y''''' + 12x^3y''' - 2y^7y'' - 8y = 0

My solution:
u1' = u2
u2' = u3
u3' = u4
u4' = u5
u5' = -6x^3(u4) + y^7(u3) + 4(u1)
 
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  • #2
I think it's correct. First and fourth order do not appear because in original equation don't appear too.
 
  • #3


Your solution looks correct to me! It does not matter that the fourth and first orders are missing in the original equation, as long as the remaining orders are properly reduced to a first-order equation. Good job!
 

1. What is a first-order equation?

A first-order equation is a mathematical equation that contains only first-order derivatives. This means that the highest power of the variable in the equation is one.

2. Why is it important to reduce higher-order equations to first-order equations?

Reducing higher-order equations to first-order equations makes them easier to solve and understand. First-order equations are also often used in real-world applications, making it important for scientists and engineers to be able to manipulate and solve them.

3. How do you reduce a higher-order equation to a first-order equation?

To reduce a higher-order equation to a first-order equation, you can use techniques such as substitution, integration, or separation of variables. The specific method will depend on the type of higher-order equation and its initial conditions.

4. Can all higher-order equations be reduced to first-order equations?

No, not all higher-order equations can be reduced to first-order equations. Some equations may require special techniques or may not have a solution in terms of first-order derivatives.

5. What are some common applications of first-order equations in science?

First-order equations are commonly used in physics, chemistry, biology, and engineering to model and analyze a variety of phenomena, such as population growth, chemical reactions, and electrical circuits.

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