Solve the following equation by using quadrantic formula

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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

Which expression is not a polynomial?

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b