Solve .

Answer and explanation

Correct answer: A.

  1. Step 1: Combine the powers: .
  2. Step 2: Equate the exponents: , so .
Answer
.
Why not the others: is what you get if you forget to remove the factor . is what you get if you subtract the exponent the wrong way. is what you get if you give the power instead of the exponent.

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