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Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

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

Could someone with number 1 and 2