What is the Square Root of 81?
The square root of 81 (√81) is 9. 81 is a perfect square (9 × 9 = 81).
Exact Answer
√81 = 9
Principal Root (√81)
9
Real Roots
±9
Perfect Square?
Yes (9²)
Exponential Form
81^(1/2)
Step-by-Step Solution: √81 = 9
Step 1
Definition of Square Root
The square root of 81 is the number y such that y × y = 81.
√81 = 9
Summary & Alternative Representations
| Property / Format | Value |
|---|---|
| Principal Root (√81) | 9 |
| Real Roots | ±9 |
| Perfect Square? | Yes (9²) |
| Exponential Form | 81^(1/2) |
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Frequently Asked Questions
Is 81 a perfect square?
Yes, 81 is a perfect square because 9 × 9 = 81.