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What is the complete square (perfect square form) of x² + 18x + 81?

Question: What is the complete square (perfect square form) of x² + 18x + 81?
  • A. (x+8)²
  • B. (x+9)² ✓
  • C. (x−8)²
  • D. (x−9)²
Correct Answer: B. (x+9)²
Explanation: x² + 18x + 81 = (x + 9)² (since 2*9 = 18 and 9² = 81).

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