Simplify .
Answer and explanation
Correct answer: B.
- Step 1: Factorise the numerator (difference of two squares): .
- Step 2: Factorise the denominator: .
- Step 3: Cancel the common factor to leave .
Answer
.
Why not the others: : the sign in the factor was lost. : the wrong factor of the denominator was cancelled. : terms cannot be cancelled across addition.
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