2. Does the equation x² + y² + z²-3x - y + 3z = 0 represent a sphere? If so, find the center and the radius of the sphere. Answers must be given exactly as fractions or radicals. That is, no decimals or decimal approximations.

Q: 3) y 2r 4) y=x-4x +3

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Q: 2. Complete the square to rewrite the equation into vertex form. у %3- 2х2 + 16х — 25

A: Given:    y = - 2x2 + 16x - 25