Find the gradient of (2,1) and (4,3)

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

Solve the equation by completing the square. x^2+2x=17

Someone me! if you’re smart you can solve this!