I need help with this attachment ( Solving volume of spheres)

Question

anonymous · Answer

I need to find the volume of both spheres as a whole unit

anonymous · Answer

equations of sphere are 
$$x ^{2}+y ^{2}+z ^{2}+4x-2y+4z+5=0  ...(1)$$
$$x ^{2}+y ^{2}+z ^{2}=4   ....(2)$$

anonymous · Answer

find radius then volume
$$=\frac{ 4 }{3 }\pi r ^{3}$$

anonymous · Answer

why 4/3?pi

anonymous · Answer

you wanted the volume of sphere.
I have given the volume of one sphere only.

anonymous · Answer

can you solve it ?

radar · Answer

In regards to @teague19 question why V=(4/3)(r)(pi).  This is the standard formula published in text and reference manuals,   I bet if you look hard enough you will find that in your study material, if not, Google "Volume of Sphere"

radar · Answer

Now referring to the help furnished by @surjithayer he has already solved for the radius of one of the spheres, the one that is located at (0,0,0) getting a radius which was the square root of 4, or 2.  Plug the value (2) for r and solve the volume of that sphere.

radar · Answer

The other sphere is not located at the origin, but at another location for its center.  Use completing the square and you will be able to not only know where it's center is located but you will have the radius also.  Good luck.