# Integral of (x + 5)/sqrt(16 - (x - 4)^2) using Inverse Sine | Summary and Q&A

2.5K views
May 12, 2015
by
The Math Sorcerer
Integral of (x + 5)/sqrt(16 - (x - 4)^2) using Inverse Sine

## TL;DR

The video explains how to solve a difficult indefinite integral by using clever substitutions and rewriting the integral in a strategic way.

## Key Insights

• 🍳 Rewriting a complex indefinite integral by adding a constant and breaking it up can simplify the problem.
• 😄 Clever substitution techniques, such as u-substitution, can be valuable in solving challenging integrals.
• 😑 Differentiating the new expression and integrating separately can make the integration process more manageable.
• 🫠 The arc sign formula is useful in integrating expressions involving square roots and helps solve the second part of the rewritten integral.
• 🥳 Breaking down complex problems into smaller, more manageable parts can lead to easier solutions in mathematical calculations.
• 👻 Paying attention to the constant terms in an integral can help simplify the problem and allow for easier substitutions.
• 📏 It is crucial to understand the rules and formulas of integration to effectively solve complex mathematical problems.

## Transcript

we have an indefinite integral this one is a little bit harder so solution now if it wasn't for this uh pesky X that's up here um this would simply be a u substitution that would lead to an arc sign uh but because we have the X we have to rewrite this integral in a clever way so let's start by rewriting it first so we have x + 5 ID the square < TK ... Read More

## Questions & Answers

### Q: What is the trick to solving this difficult indefinite integral?

The trick is to rewrite the integral by breaking it up and adding a constant, which allows for the use of a u-substitution.

### Q: How can we simplify the first integral after rewriting it?

By dividing the expression by -2, we can simplify the integral to -2du/(sqrt(U)), where U is the new expression obtained from the rewriting process.

### Q: Why is it important to differentiate the new expression and integrate separately?

By differentiating the new expression, we can simplify it and make the integration easier. Integrating separately allows us to solve each part of the integral more effectively.

### Q: What is the formula for the arc sign, and how is it used in the second integral?

The formula for the arc sign is DX/(sqrt(a^2 - x^2)), and it is used to integrate the second part of the rewritten integral, replacing W with x - 4 and applying the formula accordingly.

## Summary & Key Takeaways

• The video demonstrates how to rewrite a challenging indefinite integral by breaking it up and using clever substitution.

• By rewriting the integral and adding a constant, the video simplifies the problem and enables the use of a u-substitution.

• The video then demonstrates how to differentiate the new expression, integrate it, and arrive at the final answer.

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