If , what is the value of ?
Answer and explanation
Correct answer: C. 6
- Step 1: Expand the right side: .
- Step 2: Set equation: .
- Step 3: Subtract from both sides: .
- Step 4: Add 5 to both sides: .
Answer
6.
Why not the others: '8' forgets to subtract 7 from 8; '4' subtracts 1 from 5; '10' adds 5 to 5 without balancing.
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