Oops, sorry for the typo in the title. :|
Need help with these please:
In the expansion of (1-ax)^n, the first three terms are 1-12x-63x^2. Find the values of a and n.
In the expansion of (x-(1/x^2))^8 find:
a) The term that has x^-1
b) The coefficient of the term that has x^2.
Just to make the second one a little clearer, here's something I whipped up with my MSPaint skills: