Question

What are the first four terms of the sequence defined by the following equation?

an = 5·3n - 1

5 , 15 , 225 , 3,375 ...
15 , 45 , 135 , 405 ...
5 , 15 , 45 , 135 ...
15 , 225 , 3,375 , 50,625 ...

Answer 1

well subtitute n = 1 and see what you get

\[a{1} = 5 \times 3^{1 - 1} = 5 \times 3^0 = 5\]

repeat the process for n = 2, n = 3 and n = 4

Answer 2

Your equation is a bit hard to read and interpret. I suspect you meant\[a _{n}=5*3^{n-1}\]Is that the correct interpretation?

Answer 3

Yes