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The question asks: **What does \( i^2 \) equal?**

### Answer:
The correct answer is **\(-1\)**.

### Explanation:
The imaginary unit \( i \) is defined as:
\[
i = \sqrt{-1}
\]
Squaring both sides gives:
\[
i^2 = -1
\]

This property is fundamental in complex numbers, where \( i \) is used to represent the square root of negative numbers.

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Let me know if you'd like a more detailed explanation or further examples! Here are 5 related questions to expand on this concept:

1. What is \( i^3 \) equal to in terms of \( i \)?
2. How do you simplify powers of \( i \) (e.g., \( i^{4}, i^{5} \))?
3. How does the imaginary unit \( i \) relate to complex numbers like \( 3 + 4i \)?
4. Can you graph complex numbers on a coordinate plane?
5. How do \( i \) and complex numbers appear in solving quadratic equations?

### Tip:
The powers of \( i \) follow a repeating cycle:  
- \( i^1 = i \)  
- \( i^2 = -1 \)  
- \( i^3 = -i \)  
- \( i^4 = 1 \), and then it repeats.

Learn why i² equals -1 in mathematics and its importance in complex numbers. This fundamental property of the imaginary unit, defined as the square root of -1, is essential for students learning algebra and advanced mathematics. Suitable for Grades 9-12.

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