Intro to Differential Equations Problem #1

In summary, the general solution to the differential equation y''-5y'+6y = 0 is y = c1e^3x+c2e^2x. This can be found by solving for the roots of the characteristic equation, m^2 - 5m + 6 = 0, and using the general form of the solution y = c1e^m1x+c2e^m2x. It is always recommended to check the solution to ensure it satisfies the original differential equation.
  • #1
JosephK
40
2

Homework Statement


1. Find the general solution to the differential equation:
y''-5y'+6y = 0


Homework Equations





The Attempt at a Solution


m^2 - 5m + 6 = 0
(m-1)(m-5) = 0
y' = Ae^x+Be^5x
 
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  • #2
JosephK said:

Homework Statement


1. Find the general solution to the differential equation:
y''-5y'+6y = 0


Homework Equations





The Attempt at a Solution


m^2 - 5m + 6 = 0
(m-1)(m-5) = 0
Your factorization is incorrect. (m - 1)(m - 5) = m2 - 6m + 5, not m2 - 5m + 6.
JosephK said:
y' = Ae^x+Be^5x
 
  • #3
This cannot be factored.
 
  • #4
JosephK said:
This cannot be factored.
(m - 3)(m - 2) ?
 
  • #5
So the answer to this differential equation is

y = c1e^3x+c2e^2x?
 
  • #6
Yes, and you can check for yourself that your solution satisfies the differential equation. It's always a good idea to check.
 

FAQ: Intro to Differential Equations Problem #1

What is a differential equation?

A differential equation is a mathematical equation that describes the relationship between a function and its derivatives. It involves the use of derivatives to model the behavior of a system and predict future values of the function.

What is the purpose of solving differential equations?

The purpose of solving differential equations is to understand and predict the behavior of a system over time. It is a powerful tool used in many fields such as physics, engineering, economics, and biology to model and solve real-world problems.

How is a differential equation different from a regular equation?

A regular equation involves variables and constants, while a differential equation involves derivatives of a function. This means that the solution to a differential equation is a function, rather than a single value.

What are some common methods for solving differential equations?

Some common methods for solving differential equations include separation of variables, substitution, and using special functions such as exponential and trigonometric functions. Numerical methods, such as Euler's method and Runge-Kutta methods, are also commonly used for solving differential equations.

How are differential equations used in real-world applications?

Differential equations are used in many real-world applications, such as predicting population growth, modeling the spread of diseases, analyzing the behavior of electrical circuits, and predicting the motion of objects in physics. They are also used in finance and economics to model stock market trends and interest rates.

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