3.b.1 - 2016 Q5
(a) Find the first 3 terms, in ascending powers of x, of the binomial expansion of
(2 – 9x)
4
giving each term in its simplest form. (4)
f(x) = (1 + kx)(2 – 9x)4, where k is a constant
The expansion, in ascending powers of x, of f(x) up to and including the term in x2 is
A – 232x + Bx2
where A and B are constants.
(b) Write down the value of A. (1)
(c) Find the value of k. (2)
(d) Hence find the value of B. (2)
giving each term in its simplest form. (4)
The expansion, in ascending powers of x, of f(x) up to and including the term in x2 is
where A and B are constants.
(b) Write down the value of A. (1)
(c) Find the value of k. (2)
(d) Hence find the value of B. (2)