Helpp I cant get the answerWhats 6 divided by 2 ( 1 + 2)

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

With alll of except for the 2 that i did already

What rotation was applied to triangle def to create d’e’f’?