- #1
mr_coffee
- 1,629
- 1
Hello everyone, it was the first day of calc III class and this one problem says: Describe the set of points whose coordinates satisfy the given equation and inequalitites. Sketch the graphs.
x^2 + y^2 + z^2 = 25; x = 3;
What exactly am I suppose to do? The book doesn't show any examples of this, they just go straight into saying what an equation of a sphere is with center C(h,k.l) and radius r is (x-h)^2 +(y-k)^2 +(z-l)^1 = r^2; In particular, if the center is orgin O, then an equation of the sphere is
x^2+y^2+z^2 = r^2;
Now this looks very smilair to the above equation given, so I'm assuming its a sphere, with radius 5. But what's the x for, and how do i describe the set of points whose coordinates satisfy the given equation?> THanks
x^2 + y^2 + z^2 = 25; x = 3;
What exactly am I suppose to do? The book doesn't show any examples of this, they just go straight into saying what an equation of a sphere is with center C(h,k.l) and radius r is (x-h)^2 +(y-k)^2 +(z-l)^1 = r^2; In particular, if the center is orgin O, then an equation of the sphere is
x^2+y^2+z^2 = r^2;
Now this looks very smilair to the above equation given, so I'm assuming its a sphere, with radius 5. But what's the x for, and how do i describe the set of points whose coordinates satisfy the given equation?> THanks