Two Differential Equation Problems

In summary, The conversation discusses using the exponential shift to solve a differential equation with the function \psi(x)e^{-a_{1}\frac{x}{n}}. The steps for solving this equation are outlined and the listener is asked to complete the solution.
  • #1
JM00404
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Please see the PDF attatchment to view the problems. Thank you for your time.
 

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  • #2
For 1:
What diff.eq does [tex]\psi(x)e^{-a_{1}\frac{x}{n}}[/tex] fulfill?
 
  • #3
JM00404 said:
Please see the PDF attatchment to view the problems. Thank you for your time.

The first one (too late I know but anyway):

Let's do a simple one first:

[tex]y^{''}+a_1y^{'}+a_2y=0[/tex]

or:

[tex](D^2+a_1D+a_2)y=0[/tex]

or:

[tex]f(D)y=0[/tex]

Now, use the exponential shift:

[tex]e^{cx}f(D)y=f(D-c)[e^{cx}y][/tex]

so up there, multiply by:

[tex]e^{a_1x/2}[/tex]

so:

[tex]e^{a_1x/2}f(D)y=f(D-a_1/2)[e^{a_1x/2}\phi]=0[/tex]

can you finish it?

[tex]f(D-a_1/2)=(D-a_1/2)^2+a_1(D-a_1/2)+a_2[/tex]
 

FAQ: Two Differential Equation Problems

What is a differential equation?

A differential equation is a mathematical equation that describes the relationship between a function and its derivatives. It is used to model various physical phenomena and is an important tool in many fields of science and engineering.

What are the two types of differential equations?

The two main types of differential equations are ordinary differential equations (ODEs) and partial differential equations (PDEs). ODEs involve a single independent variable and its derivatives, while PDEs involve multiple independent variables and their partial derivatives.

How do you solve a differential equation?

There are various methods for solving differential equations, depending on the type and complexity of the equation. Some common techniques include separation of variables, substitution, and using integrals. In some cases, differential equations can also be solved numerically using computer software.

What are initial and boundary conditions in differential equations?

Initial conditions are values given for the dependent variable and its derivatives at a specific point, typically at the beginning of the problem. Boundary conditions, on the other hand, are values given at the boundaries of the problem, such as the endpoints of an interval or the boundaries of a physical system. These conditions are necessary for finding a unique solution to a differential equation.

What are some real-world applications of differential equations?

Differential equations are used to model and solve a wide range of real-world problems in various fields, including physics, chemistry, biology, economics, and engineering. Some examples include modeling population growth, predicting the spread of diseases, analyzing electrical circuits, and understanding fluid dynamics.

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