Question

How to find the first five coefficients of the power series 10/(1+49x^2)?

Answer 1

think if it as a geometric series

Answer 2

I understand that part. I don't know how to find the coefficients reliably.

Answer 3

treat is as
\[\frac{1}{1+(9x)^2}\]
\[=1-(9x)+(9x)^2-(9x)^3+...\]

Answer 4

Do you mean \[1/(1 - (-7x)^2) ? \]

Answer 5

where r = (-7x)? because 9*9 is 81 not 49