In advanced mathematics (pitkä matematiikka), what is the equation of the sphere centered at with radius ?

Answer and explanation

Correct answer: A.

  1. Step 1: The standard equation of a sphere with center and radius is . Substituting and gives . **Answer: . Why not the others:** The second option reverses all center signs, the third uses instead of , and the fourth misses the sign of the -coordinate.

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