Solve .
Answer and explanation
Correct answer: B.
- Step 1: Expand the bracket: .
- Step 2: Subtract from both sides: .
- Step 3: Add : , so .
Answer
.
Why not the others: : This expands the bracket as , multiplying only the first term, then solves . : This expands the bracket as , getting the sign wrong, then solves . : This forgets to add the back and solves .
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