Find the coefficient of the terms in x as indicated , in the following expansions .
(a) , term in x^3
(b) , term in x^2 .
Thanks .
In the expansion of the term is given by
(a)
, term in x^3
=(x^2+2x+1) (2-3x)^7
For (a)
For getting x^3 the degree of x in second term should be one
(see the formula above)
Hence
in
eliminate x to get value of coefficient
Go ahead with the b and c other terms
2)
(b) , term in x^2 .
If you understood 1 you can do it tell incase if you get stuck again