Determine the y valueHelp me

Fast phone couldn’t copy and paste so i decided to right it down

Proceed as in example 3 in section 6.1 to rewrite the given expression using a single power series whose general term involves xk. ∞ n(n − 1)cnxn − 2 n = 2 − 4 ∞ ncnxn n = 1 + ∞ cnxn n = 0

Indicate the formula for the following conditions: p^c(n,r)=