Question

Find the sum of the geometric sequence 4, 16, 64, 256, 1024.

Answer 1

Formula:

Sn = a1(1-r^n)/(1-r) [all the variable retain their previous meaning]

Answer 2

What Would R Be In the Sequence

Answer 3

4r = 16
16r = 64
....

Answer 4

Would The Equation Look Like This
4(1-1024^5)/(1-1024)

Answer 5

\[4(\frac{ 1-4^{5} }{ 1-4 })\]

or since they showed all the numbers they needed to add, just add them up.

The formula will serve you when they show 4 terms and want the sum of 10.