is expanded as a series in ascending powers of x, the coefficients of x and
are -6 and 27 respectively.
a) Find the value of a and the value of n.
b) Find the coefficient of
c) State the set of values of x for which the expansion is valid.
I have attempted this question by trying to find simultaneous equations by comparing coefficients but I do not think it is the correct method since it seemed to be getting too complicated.
If someone could tell me whether i have done the first question correctly and show me how to do the second i would greatly appreciate it. Thanks in advance!