The curve has two stationary points. Find the difference between their -coordinates (larger minus smaller).

Answer and explanation

Correct answer: A.

  1. Step 1: Setting gives and . Step 2. and ; the difference is . **Answer: . Why not the others:** is what you get if you add the -values. is what you get if you give the difference of the -values. is what you get if you mix and differences.

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