# the afterward of integral of 1/(x^3+x), feat. a mysterious guest speaker | Summary and Q&A

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September 17, 2017
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blackpenredpen
the afterward of integral of 1/(x^3+x), feat. a mysterious guest speaker

## TL;DR

Learn how to prove that two logarithmic expressions are equivalent using algebraic manipulation and the properties of logarithms.

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### Q: How does the video prove the equivalence of the left-hand side and right-hand side logarithmic expressions?

The video begins by converting the negative exponent on the left-hand side to a fraction and simplifying it. Then, the common denominator is found for the expression inside the logarithm. Finally, the difference of natural logarithms is taken, resulting in an equivalent expression to the right-hand side.

### Q: Why is the absolute value necessary when simplifying a logarithmic expression with x squared inside?

When simplifying an expression with x squared inside the logarithm, the absolute value is needed because x can be negative or positive. Without the absolute value, the expression would not hold true for negative values of x.

### Q: What is the significance of taking the difference of natural logarithms in proving equivalence?

Taking the difference of natural logarithms allows for the conversion of the fraction inside the logarithm into two separate logarithmic terms subtracted from each other. This simplifies the expression and shows its equivalence to the right-hand side.

### Q: Are there any limitations to applying logarithmic properties when proving equivalence?

One limitation is the need for the absolute value when x squared is inside the logarithm. Failure to include the absolute value can result in an incorrect proof. Additionally, some properties of logarithms may only be applicable under certain conditions, so caution should be exercised when using them.

## Summary & Key Takeaways

• The video demonstrates how to prove that two logarithmic expressions are equal by manipulating and simplifying the left-hand side to match the right-hand side.

• The process involves converting a negative exponent to a fraction, finding a common denominator, and using the properties of logarithms.

• The key insight is that when simplifying an expression with x squared inside the logarithm, the absolute value must be used due to the potential for negative values of x.