Deriving y & Solving y'' + 4y' - 5y = 0 with C

  • Thread starter Dr Game
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In summary, "Deriving y & Solving y'' + 4y' - 5y = 0 with C" is a second-order linear differential equation used to express the relationship between a function and its derivatives. The 'y' in the equation represents the dependent variable and the constant 'C' represents the family of solutions. To solve this type of equation, one must rewrite it in standard form, find the roots of the characteristic equation, and use those roots to find the general solution. Solving this type of differential equation allows us to model and predict real-world phenomena in various fields.
  • #1
Dr Game
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It's been a while, but how would you go about deriving

[tex]y = C e^-^5^x[/tex]

and plug it into this equation

[tex]y'' + 4y' - 5y = 0[/tex]

i can do this without C the answer would be 0, but what do I do with C there?
 
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  • #2
You just differentiate it as usual, leaving the C in front of the terms, and then plug the first and second derivatives into the equation.
 
  • #3
alright thought so, so I should get the same answer if C wasn't there, which is 0

[tex]25Ce^-^5^x+4(-5Ce^-^5^x)-5Ce^-^5^x = 0[/tex]
 
  • #4
Yes, that's correct
 

What is the meaning of "Deriving y & Solving y'' + 4y' - 5y = 0 with C"?

"Deriving y & Solving y'' + 4y' - 5y = 0 with C" is a mathematical equation that represents a second-order linear differential equation. In simpler terms, it is a way to express a relationship between a function and its derivatives.

What does the 'y' in the equation represent?

The 'y' in the equation represents the dependent variable, or the function that is being differentiated.

What is the purpose of the constant 'C' in the equation?

The constant 'C' is known as the arbitrary constant and it represents the family of solutions to the differential equation. It is used to account for any variations in the initial conditions or specific values of the function.

What are the steps for solving this type of differential equation?

To solve "Deriving y & Solving y'' + 4y' - 5y = 0 with C", you would follow these steps:
1. Rewrite the equation in standard form: y'' + 4y' - 5y = 0
2. Find the roots of the characteristic equation: r^2 + 4r - 5 = 0
3. Use the roots to find the general solution: y = C1e^(-5x) + C2e^(x)
4. Use initial conditions or specific values to solve for the arbitrary constant 'C'.

What is the significance of solving this type of differential equation?

Solving "Deriving y & Solving y'' + 4y' - 5y = 0 with C" allows us to find the function that satisfies the given relationship between the function and its derivatives. This is useful in many fields, such as physics, engineering, and economics, where differential equations are used to model and predict real-world phenomena.

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