26 divided by 3 I’m horrible at matj

This question awards 100 ! i really don’t want to fail i will also mark you !

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

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x