# i-th root of -1 | Summary and Q&A

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January 28, 2023
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blackpenredpen
i-th root of -1

## TL;DR

The i-th root of -1 leads to infinitely many real numbers, and the concept can be further explored through complex numbers and Euler's formula.

## Questions & Answers

### Q: How can the i-th root of -1 be represented using complex numbers?

The i-th root of -1 is expressed using polar coordinates, with the distance from the origin denoted as R and the angle denoted as θ. The representation is re^(iθ), where r is the distance and θ is the angle.

### Q: What is Euler's formula and how does it help in understanding complex numbers?

Euler's formula, e^(iθ) = cosθ + isinθ, relates complex numbers to trigonometry. It allows for the conversion between exponential form and polar coordinates, making it easier to work with complex numbers.

### Q: How many real number solutions are there for the i-th root of -1?

The i-th root of -1 has infinitely many real number solutions. The principle value is e^π, but additional solutions can be obtained by adding 2π or -2π to the angle.

### Q: Can negative integers be plugged into the i-th root of -1?

Yes, negative integers can be used. Plugging in negative integers results in additional solutions for the i-th root of -1, such as e^(-π) or e^(-3π).

## Summary & Key Takeaways

• The i-th root of -1 can be represented using complex numbers, utilizing a coordinate system called polar coordinates.

• Euler's formula, e^(iθ) = cosθ + isinθ, helps to make sense of complex numbers.

• The i-th root of -1 has infinitely many real number solutions, with the principle value being e^π.