Solve for : .

Answer and explanation

Correct answer: B.


.
  1. Step 1: Let . The equation becomes a quadratic in : .
  2. Step 2: Factor: or .
  3. Step 3: Substitute back :
  4. Step 4: Both are valid real solutions.
Answer
.
Why not the others: '' takes directly as the answer for ; '' exponentiates instead of taking natural logarithm; '' uses equation coefficients instead of roots.

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