Question

Constant term of the expansion

Answer 1

So I need the exponents to be 0...but how can I do this?

Answer 2

You want the factor with \(x\) to have a \(0\) exponent. This means \(6-r=0\).

Answer 3

This means we have to let \(r=6\).

Answer 4

but the second element has x too

Answer 5

try this :

6-r = r

r = 3

Answer 6

And what about the a2/x ?

Answer 7

The variable will be there for the second part

Answer 8

u need to choose \(r\) such that the variable in top and bottom cancels out

Answer 9

So you have \(x^{6-r}x^{-r} = x^{6-2r}\), I guess.

Answer 10

k, thanks