When (1 + ax) n is expanded as a series in ascending powers of x, the coefficients

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When (1 + ax)ⁿ is expanded as a series in ascending powers of x, the coefficients of x and x² are −6 and 27 respectively.

a. Find the values of a and n.

b. Find the coefficient of x³.

c. State the values of x for which the expansion is valid.

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Pearson Edexcel A Level Mathematics Pure Mathematics Year 2

ISBN: 9781292183404

1st Edition

Authors: Greg Attwood, Jack Barraclough, Ian Bettison, David Goldberg, Alistair Macpherson, Joe Petran

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Question Posted: Aug 10, 2023 08:01 AM

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When (1 + ax) n is expanded as a series in ascending powers of x, the coefficients

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Pearson Edexcel A Level Mathematics Pure Mathematics Year 2

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