Question

find the equation of the sphere with centre (1, -1, 2) and radius 3​

Answer 1

Answer:

the equation of a sphere :-----

(x-h)²+(y-k)²+(z-l)² = r²

where (h,k,l) is the center of the sphere and r is the radius of the sphere.

Now, using values we get,

(x-1)²+(y+1)²+(z-2)² = 9

x²+1-2x+y²+1+2y+z²+4-4z = 9

or,

x²-2x+y²+2y+z²-4z = 3 (Ans)

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