(i)[3]
Find the first three terms of the expansion of $(2 + ax)^5$ in ascending powers of $x$.
(ii)[3]
With the coefficient of $x^2$ in $(1 + 2x)(2 + ax)^5$ equal to $240$, find the possible values of $a$.
Mathematics 9709 · AS & A Level · Series
Mathematics 9709 · AS & A Level · Series
Find the first three terms of the expansion of $(2 + ax)^5$ in ascending powers of $x$.
With the coefficient of $x^2$ in $(1 + 2x)(2 + ax)^5$ equal to $240$, find the possible values of $a$.