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**1. Homework Statement**

The equation represents a sphere.

16x^2+16y^2+16z^2-96x+32y=5

Find its center, and radius

**2. Homework Equations**

**3. The Attempt at a Solution**

i found the center by completing the square:

16[(x^2-6x+9)+(y^2+2y+1)+(z^2)]=5+9+1

16[(x-3)^2 +(y+1)^2 +(z+0)^2]=15

the center is (3,-1,0)

i thought the radius would be (15^.5)/4 but that was incorrect if someone could please help me thank you