Rearrange to make the subject.
Answer and explanation
Correct answer: B.
- Step 1: Multiply by : , so .
- Step 2: Collect terms: .
- Step 3: Factorise: , so .
Answer
.
Why not the others: : makes a sign error when collecting the constant terms. : makes a sign error on the terms. : divides by the wrong coefficients after expanding.
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