For all real , is equivalent to which expression?
Answer and explanation
Correct answer: C.
- Step 1: Express each term with a common base of : , , and .
- Step 2: Combine the numerator powers using exponent addition: .
- Step 3: Subtract the denominator exponent: .
Answer
.
Why not the others: - '' drops the constant terms entirely and miscalculates as . - '' treats as in the denominator instead of (). - '' makes an error subtracting , treating it as with a sign inversion or omitted term.
Practise more Exponents and radicals.
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