Answer and explanation

Correct answer: C. 5

  1. Step 1: Square both sides: .
  2. Step 2: Subtract 1 from both sides: .
  3. Step 3: Divide by 3: .
  4. Step 4: Check: (valid).
Answer
5.
Why not the others: '3' calculates ; '7' adds 1 to 16 before dividing; '9' squares 16.

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