Laplace transform w/ partial fraction

In summary, the initial value problem is to solve y"+2y'+y=(8/3)cos(2t)-2sin(2t) with initial conditions y(0)=1 and y'(0)=7/3 using Laplace transforms. The attempted solution has obtained the expression Y={s^3+(13/3)s^2+(20/3)s+(40/3)}/{(s^2+4)(s^2+2s+1)}, but help is needed in turning the denominator into partial fractions. A helpful site for solving similar problems is quickmath.com, which can do algebra, solve equations/inequalities, plot equations/inequalities, and perform matrix arithmetic.
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SpartanArt
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Homework Statement


solve the following initial value problem using Laplace transforms
y"+2y'+y=(8/3)cos(2t)-2sin(2t)
y(0)=1
y'(0)=7/3


Homework Equations


L[d^2y/dt^2]=s^2Y-sy(0)-y'(0)
L[dy/dt]=sY-y(0)
L[coswt]=s/(s^2+w^2)
L[sinwt]=w/(s^2+w^2)


The Attempt at a Solution



so far: Y={s^3+(13/3)s^2+(20/3)s+(40/3)}/{(s^2+4)(s^2+2s+1)}
need help turning denominator into partial fraction.
Thanks!
 
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  • #2
www.quickmath.com - powered by webMathematica: this site is very handy and will do algebra (factoring, simplify, partial fraction decomposition, expand), solve equations/inequalities (single or a system), plot equations/inequalities (single or a system), derivatives, definite or indefinite integrals, and do matrix arithmetic/inverses/determinants.
 
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  • #3
thanks a lot!
 

Related to Laplace transform w/ partial fraction

What is Laplace transform with partial fraction?

Laplace transform with partial fraction is a mathematical technique used to simplify complex functions into simpler forms by breaking them down into a sum of partial fractions. This allows for easier analysis and calculation of the original function.

Why is Laplace transform with partial fraction useful?

Laplace transform with partial fraction is useful because it can help solve differential equations and other complex problems in engineering, physics, and mathematics. It can also be used to find the inverse Laplace transform, which is helpful in solving initial value problems.

What are the steps to perform Laplace transform with partial fraction?

The steps to perform Laplace transform with partial fraction are as follows:
1. Take the Laplace transform of the original function.
2. Factor the denominator of the resulting expression into linear and quadratic terms.
3. Express the resulting expression as a sum of partial fractions.
4. Solve for the coefficients of the partial fractions using algebraic manipulation.
5. Take the inverse Laplace transform of each partial fraction term.
6. Combine the resulting terms to get the final solution.

What are the common applications of Laplace transform with partial fraction?

Laplace transform with partial fraction has many applications in engineering, physics, and mathematics. Some common applications include analyzing electrical circuits, solving differential equations, and determining the stability of control systems.

Are there any limitations or challenges to using Laplace transform with partial fraction?

One limitation of Laplace transform with partial fraction is that it can only be applied to functions that have a Laplace transform. Additionally, the process of finding the partial fraction decomposition can be time-consuming and may require advanced algebraic skills. It is also important to carefully consider the convergence of the resulting series before using the inverse Laplace transform to find the solution.

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