k (x- 1) k+ 2 ek=0

Find the interval of convergence of the series -1 n8" O (-1, 1) O (-8, 8] O (-8, 8) O (-8, 8) O [-8, 8] O [-1, 1)

how can one combine power series? what is the convergence of the combination?

This question has several parts that must be completed sequentially. If you skip a part of the question, you will not receive any points for the skipped part, and you will not be able to come back to the slipped part Tutorial Exercise Find the interval of convergence of the power series. (Be sure to include a check for convergence at the endpoints of the interval.) Step 1 (4x)" (an)! Recall the Ratio Test, which states that if a, is a series with nonzero terms, and lim 1, or lim 1 For any fixed value of x such that x 0, let a (4x)" (an)! and find lim 518 (4x)+1 lim 518 = lim (3(n+1)) 719 (a) (3n) (3n)! (4x)+1) = - (3(n+1))! 880.0 (-00,00) X Step 2 By the Ratio Test, the series converges if lim Submit Skip (you cannot come back) 518 1. Therefore, the series converges for x such that lim =, then, diverges