In the expansion of #(a+x)(1-x/4)^n#, the first three terms are #4+bx+5/4x^2#, where #n# is a positive integer greater than #2#. Find the values of #n#, of #a# and of #b#?
1 Answer
Feb 20, 2018
Explanation:
Using binomial expansion
=
and
=
=
=
As first three terms are
Putting
or
and as
and as
Hence,