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17-20 Show that the equation represents a sphere, and find its center and radius. 18. x2 + y2 + z2 + 8x - 6y +

17-20 Show that the equation represents a sphere, and find its center and radius. 18. x2 + y2 + z2 + 8x - 6y + 2z + 17 = 0 19. 2x2 + 2y2 + 2z2 = 8x - 24z + 1

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