Work out .
Answer and explanation
Correct answer: A.
- Step 1: A negative power means take the reciprocal first: .
- Step 2: Square top and bottom: .
Answer
.
Why not the others: : This squares the fraction but does not take the reciprocal. : This makes the answer negative, which a negative index does not do. : This divides the denominator by the power rather than squaring both parts.
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