Question: a) Write down the first three terms, in ascending powers of x, in the expansion of (1 + ax) n where a 0 and

a) Write down the first three terms, in ascending powers of x, in the expansion of (1 + ax)n where a ≠ 0 and n > 2.

b) The coefficient of the x² term is half the
coefficient of the term in x.
Show that n =
1 + a/a.

c) Find the coefficient of the x² term when a = 1/5.

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