Determine a3 if an is geometric progression and a4-a2=18 and a5-a3=36
abczyz:
a3 is 12
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a4-a2=18
so ar^3-ar=18
r^2-1=18/ar
a5-a3=36
ar^4-ar^2=36
r^2-1=36/ar^2
on solving both eqns
r=2
refer to img
so ar^3-ar=18
r^2-1=18/ar
a5-a3=36
ar^4-ar^2=36
r^2-1=36/ar^2
on solving both eqns
r=2
refer to img
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