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2020 paper 1

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The first three terms, in ascending powers of x, of the binomial expansion of (9 þ 2x) 1 2 are given by (9 þ 2x) 1 2 a þ x 3 x2 54 where a is a constant. 1 (a) State the range of value ... s of x for which this expansion is valid. Circle your answer. [1 mark] jxj < 2 9 jxj < 2 3 jxj < 1 jxj < 9 2 1 (b) Find the value of a. Circle your answer. [1 mark] 1 23 9 [Show More]

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