How does g vary with height and depth - Physics -

Question

How does g vary with height and depth?

Rahul Jakhmola · Accepted Answer

I have posted this from another student's answer:
You must know that g (gravitational acceleration) =
GM/r2,
where
G = Gravitational constant,
M = mass of heavenly body and
r = radius of the heavenly body
g at height h = GM / (r+h)2 = GM /
r2+h2+2rh
g at depth x = GM / (r-x)2 = GM /
r2+x2-2rx