What does "i^2" equal?

The expression "i^2" represents the square of the imaginary unit "i," which is defined in mathematics as the square root of -1. Therefore, when you square "i," you get "i" multiplied by itself, which mathematically is expressed as:

i * i = i^2 = -1.

This fundamental property of "i" is critical in complex number arithmetic, where "i" helps represent and work with square roots of negative numbers. The definition establishes that "i" is not merely an arbitrary symbol but has a specific value, allowing us to perform calculations involving complex numbers effectively.

The result of "i^2" being equal to -1 is essential for understanding many concepts in higher mathematics, such as complex plane geometry and various applications in engineering and physics.