Question 248480
Geometric mean of 8 and 32 
L=a*r^(n-1) 
L=32
a=8
n=3
32=8*r^(3-1)
32=8*r^2
r^2=32/8
r^2=4
r=sqrt4
r=+-2 ans.
Proof:
8,[16],32
8,[-16],32