Question: 4. (a) Using the extended binomial expansion, find the first three terms of the expansion of 4/81+ ax in ascending powers of x, giving the

4. (a) Using the extended binomial expansion, find the first three terms of the expansion of 4/81+ ax in ascending powers of x, giving the answer in terms of a . [3] It is given that the product of the coefficient of x and the coefficient of x is -0.5. ( b ) Find the value of a . [2] (c) State the range of values of x for valid binomial expansion. [2]

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