# Inverse Laplace Transform of s/(s^2 + 6s + 10) | Summary and Q&A

25.9K views
March 18, 2020
by
The Math Sorcerer
Inverse Laplace Transform of s/(s^2 + 6s + 10)

## TL;DR

In this video, the process of finding the inverse Laplace transform of a given expression is explained, using techniques such as factoring and completing the square.

## Key Insights

• 😑 Factoring is an important step in simplifying the expression and identifying common factors.
• 😑 Completing the square allows for the expression to be written in a form suitable for applying the inverse Laplace transform.
• 😑 The shifting technique helps in aligning the expression with known formulas for the inverse Laplace transform.
• 😒 The use of negative exponential terms after the shift indicates a decay behavior in the time domain.
• 😑 Understanding the concept of perfect square trinomials can help in identifying patterns and simplifying expressions.
• ❎ The inverse Laplace transform formula for s over s squared plus K squared is cosine KT, while the formula for K over s squared plus K squared is sine KT.
• 😑 Shifting involves changing the variables in the expression to align with the desired form for the inverse Laplace transform.

## Transcript

in this video we're going to find the inverse applause of this expression here so whenever you have something like this you should always try to factor it first so let's think we need two numbers that multiply to ten and add to 6 well 2 times 5 is 10 that's not gonna add to 6 1 and 10 I think right of luck so the next thing to do is to complete the... Read More

## Questions & Answers

### Q: Why is it important to factor the given expression before finding the inverse Laplace transform?

Factoring helps in simplifying the expression and identifying any common factors that can be canceled out, making it easier to apply the inverse Laplace transform formulas.

### Q: What is the purpose of completing the square in the process?

Completing the square allows for the expression to be written in a specific form (a perfect square trinomial), which has a known formula for the inverse Laplace transform.

### Q: How does the shifting technique help simplify the expression?

Shifting involves changing the variables in the expression to make it fit the standard formulas for the inverse Laplace transform. It helps in converting the expression to a known form that can be easily transformed.

### Q: What is the significance of the negative sign in the exponential term after the shift?

The negative sign indicates that the exponential term is in the denominator of the expression, which corresponds to a decay behavior in the time domain.

## Summary & Key Takeaways

• The video explains the step-by-step process of finding the inverse Laplace transform of a given expression.

• The content emphasizes the importance of factoring and completing the square before applying specific formulas.

• The video also introduces the concept of a perfect square trinomial and the use of shift in order to simplify the expression.