Solve for : .
Answer and explanation
Correct answer: C. 5
- Step 1: Square both sides: .
- Step 2: Subtract 1 from both sides: .
- Step 3: Divide by 3: .
- 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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