a) Write down the first three terms, in ascending powers of x, in the expansion of (1
Question:
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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Related Book For
Complete Pure Mathematics 1 For Cambridge International AS & A Level
ISBN: 9780198427438
2nd Edition
Authors: Jean Linsky, Brian Western, James Nicholson
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