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MY NOTES

SCALC$912\mathrm{.}1\mathrm{.}048.$

Find an equation of the sphere with points $P$ such that the distance from $P$ to $A(-3,4,4)$ is twice the distance from $P$ to $B(6,3,-1).$

$(x-9{)}^2(y-\frac{8}{3}{)}^2+(z+\frac{8}{3}{)}^2=\sqrt[\phantom{2}]{\frac{428}{9}}$

Find its center and radius.

center $(x,y,z)=(9,\frac{8}{3},-\frac{8}{3})$

radius

$\sqrt[\phantom{2}]{\frac{428}{9}}$

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