Which of the following is equivalent to ?
Answer and explanation
Correct answer: B.
- Step 1: Multiply numerator and denominator by the conjugate .
- Step 2: The denominator becomes .
- Step 3: The numerator is , so the result is .
Answer
.
Why not the others: keeps the wrong sign; forgets to divide by ; the option uses as the denominator.
Practise more Exponents and radicals.
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